Here you can see 2 day old post warning about the danger of not using email/captcha verification:
https://lemmy.ml/post/1345031
And here are stats of lemmy platform where it shows that we gained 200 000 lemmy users in 2 days:
https://lemmy.fediverse.observer/dailystats
Another tracking site with the same explosion in users: https://the-federation.info/platform/73
What do you think? Is it some sort of a bug or do people run bot farms?
Edit2: It's been now 3 days and we went from 150 000 user accounts 3 days ago to 700 000 user accounts today making it 550 000+ bot accounts and counting. Almost 80% accounts on lemmy are now bots and it may end up being an very serious issue for lemmy platform once they become active.
Edit3: It's now 4th day of the attack and the amount of accounts on lemmy has almost reached 1 200 000. Almost 90% of total userbase are now bots.
Edit 3.1: my numbers are outdated, there are currently 1 700 000 accounts which makes it even worse: https://fedidb.org/software/lemmy
There are almost 1000 lemmy instances already. Getting individuals to fix their signup settings so that they mandate CAPTCHA likely will have to be driven from the lemmy product update level and an agreed upon defederation list for non-conformant instances.
And bot farms would be able to spin up new instances themselves, so being able to do a blacklist based federation model (federate with all by default except x, y, and z) isn't going to be viable. There's going to have to be a whitelist (federate only with a, b, and c) and maintaining that as new instances get added will be problematic without an overarching way of pushing updates of known "good" instances automatically.