diff --git a/src/activitypub/actors.js b/src/activitypub/actors.js
index 1962294a24..c6894b7c3b 100644
--- a/src/activitypub/actors.js
+++ b/src/activitypub/actors.js
@@ -411,7 +411,6 @@ Actors.assertGroup = async (ids, options = {}) => {
 		db.sortedSetAdd('usersRemote:lastCrawled', groups.map(() => now), groups.map(p => p.id)),
 		db.sortedSetAddBulk(queries.searchAdd),
 		db.setObject('handle:cid', queries.handleAdd),
-		_migratePersonToGroup(categoryObjs),
 		db.setsAdd(masksAdd, 'topics:create'),
 		db.setsRemove(masksRemove, 'topics:create'),
 	]);
@@ -419,41 +418,6 @@ Actors.assertGroup = async (ids, options = {}) => {
 	return categoryObjs;
 };
 
-async function _migratePersonToGroup(categoryObjs) {
-	// 4.0.0-4.1.x asserted as:Group as users. This moves relevant stuff over and deletes the now-duplicate user.
-	let ids = categoryObjs.map(category => category.cid);
-	const slugs = categoryObjs.map(category => category.slug);
-	const isUser = await db.isObjectFields('handle:uid', slugs);
-	ids = ids.filter((id, idx) => isUser[idx]);
-	if (!ids.length) {
-		return;
-	}
-
-	await Promise.all(ids.map(async (id) => {
-		const shares = await db.getSortedSetMembers(`uid:${id}:shares`);
-		let cids = await topics.getTopicsFields(shares, ['cid']);
-		cids = cids.map(o => o.cid);
-		await Promise.all(shares.map(async (share, idx) => {
-			const cid = cids[idx];
-			if (cid === -1) {
-				await topics.tools.move(share, {
-					cid: id,
-					uid: 'system',
-				});
-			}
-		}));
-
-		const followers = await db.getSortedSetMembersWithScores(`followersRemote:${id}`);
-		await db.sortedSetAdd(
-			`cid:${id}:uid:watch:state`,
-			followers.map(() => categories.watchStates.tracking),
-			followers.map(({ value }) => value),
-		);
-		await user.deleteAccount(id);
-	}));
-	await categories.onTopicsMoved(ids);
-}
-
 Actors.getLocalFollowers = async (id) => {
 	// Returns local uids and cids that follow a remote actor (by id)
 	const response = {
diff --git a/test/activitypub/actors.js b/test/activitypub/actors.js
index 7106dced69..2e2375e2ce 100644
--- a/test/activitypub/actors.js
+++ b/test/activitypub/actors.js
@@ -76,105 +76,6 @@ describe('Actor asserton', () => {
 			assert.strictEqual(assertion.length, 1);
 			assert.strictEqual(assertion[0].cid, actor.id);
 		});
-
-		describe('remote user to remote category migration', () => {
-			it('should not migrate a user to a category if .assert is called', async () => {
-				// ... because the user isn't due for an update and so is filtered out during qualification
-				const { id } = helpers.mocks.person();
-				await activitypub.actors.assert([id]);
-
-				const { actor } = helpers.mocks.group({ id });
-				const assertion = await activitypub.actors.assertGroup([id]);
-
-				assert(assertion.length, 0);
-
-				const exists = await user.exists(id);
-				assert.strictEqual(exists, false);
-			});
-
-			it('should migrate a user to a category if on re-assertion it identifies as an as:Group', async () => {
-				// This is to handle previous behaviour that saved all as:Group actors as NodeBB users.
-				const { id } = helpers.mocks.person();
-				await activitypub.actors.assert([id]);
-
-				helpers.mocks.group({ id });
-				const assertion = await activitypub.actors.assertGroup([id]);
-
-				assert(assertion && Array.isArray(assertion) && assertion.length === 1);
-
-				const exists = await user.exists(id);
-				assert.strictEqual(exists, false);
-			});
-
-			it('should migrate any shares by that user, into topics in the category', async () => {
-				const { id } = helpers.mocks.person();
-				await activitypub.actors.assert([id]);
-
-				// Two shares
-				for (let x = 0; x < 2; x++) {
-					const { id: pid } = helpers.mocks.note();
-					// eslint-disable-next-line no-await-in-loop
-					const { tid } = await activitypub.notes.assert(0, pid, { skipChecks: 1 });
-					// eslint-disable-next-line no-await-in-loop
-					await db.sortedSetAdd(`uid:${id}:shares`, Date.now(), tid);
-				}
-
-				helpers.mocks.group({ id });
-				await activitypub.actors.assertGroup([id]);
-
-				const { topic_count, post_count } = await categories.getCategoryData(id);
-				assert.strictEqual(topic_count, 2);
-				assert.strictEqual(post_count, 2);
-			});
-
-			it('should not migrate shares by that user that already belong to a local category', async () => {
-				const { id } = helpers.mocks.person();
-				await activitypub.actors.assert([id]);
-
-				const { cid } = await categories.create({ name: utils.generateUUID() });
-
-				// Two shares, one moved to local cid
-				for (let x = 0; x < 2; x++) {
-					const { id: pid } = helpers.mocks.note();
-					// eslint-disable-next-line no-await-in-loop
-					const { tid } = await activitypub.notes.assert(0, pid, { skipChecks: 1 });
-					// eslint-disable-next-line no-await-in-loop
-					await db.sortedSetAdd(`uid:${id}:shares`, Date.now(), tid);
-
-					if (!x) {
-						// eslint-disable-next-line no-await-in-loop
-						await topics.tools.move(tid, {
-							cid,
-							uid: 'system',
-						});
-					}
-				}
-
-				helpers.mocks.group({ id });
-				await activitypub.actors.assertGroup([id]);
-
-				const { topic_count, post_count } = await categories.getCategoryData(id);
-				assert.strictEqual(topic_count, 1);
-				assert.strictEqual(post_count, 1);
-			});
-
-			it('should migrate any local followers into category watches', async () => {
-				const { id } = helpers.mocks.person();
-				await activitypub.actors.assert([id]);
-
-				const followerUid = await user.create({ username: utils.generateUUID() });
-				await Promise.all([
-					db.sortedSetAdd(`followingRemote:${followerUid}`, Date.now(), id),
-					db.sortedSetAdd(`followersRemote:${id}`, Date.now(), followerUid),
-				]);
-
-				helpers.mocks.group({ id });
-				await activitypub.actors.assertGroup([id]);
-
-				const states = await categories.getWatchState([id], followerUid);
-				assert.strictEqual(states[0], categories.watchStates.tracking);
-			});
-		});
 	});
 
 	describe('less happy paths', () => {