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".

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[–] [email protected] 3 points 1 year ago

If someone wants an audience, I imagine spamming activity in your own communities would be more effective. If most people subscribe to the largest community in the topic they are interested in that could give you a lot of new eyes across all the instances.