Small instance, open signups, rapidly growing users. On balance, given the issues others are having, it's probably bots creating the accounts.
On my instance if you looked in the database they all had gmail emails and all had the same pattern to the email. We were adding 20 users a day, then suddenly had 100 new accounts in an hour. There was a lot of talk from other instance admins seeing the same thing.
Small instance, open signups, rapidly growing users. On balance, given the issues others are having, it's probably bots creating the accounts.
On my instance if you looked in the database they all had gmail emails and all had the same pattern to the email. We were adding 20 users a day, then suddenly had 100 new accounts in an hour. There was a lot of talk from other instance admins seeing the same thing.