@dj3ei @FediTips I think your followers (the server of the followers) are notified that the account is moved. Another interesting question is how does it know about the people that your account follows. For this you need to export the list of your followers, cf. https://docs.joinmastodon.org/user/moving/

@dj3ei

It works totally separately from the CSV files, because if it relied on CSV files people would abuse it blatantly. Spammers would upload CSV files of thousands of people who never actually followed them etc.

So, to prevent this abuse, transferring followers is done by a totally different process.

The actual step by step process is here: https://fedi.tips/transferring-your-mastodon-account-to-another-server/