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Trackers like Lemmyverse.net and Fediverse Explorer are incentivizing instance owners to inflate numbers with bots
(lemmy.world)
The vast majority of the instances in that screenshot have known jumps from 1~50 users to tens of thousands in less than a day. These instances also happen to not require a captcha on sign up.
It may very well be that instance owners are innocent as some have really been victims of bot attacks and simply forgot that you could enable captchas for sign-ups, nevertheless I think instance directories like Lemmyverse.net should start disincentivizing anyone from inflating his own instance with tens of thousands of bots in order to get on top of those "leaderboards".
Damn, that certainly a spam attack. Maybe these bots were created to make the picture of "populated" fediverse for all people that escape Reddit. But in anyway they shouldn't exist