I do not want to block all bots. I only want to block bots from specific instance. More specifically, the @alien.top instance is using most, if not all, bot accounts with random usernames. It uses that instance to post in communities of other instances. I thought about blocking other instances. But the main issue lies with random bot accounts from @alien.top. And I cannot block individually by usernames.

What shall I do to block posts posted by random bot accounts of @alien.top instance?

Update

I looked up potentially affiliated sites connected to that instance and found these.

https://level-up.zone/ (@communick, high post rate)
https://gearhead.town/?dataType=Post&page=1&sort=New (same admin, high post rate)
https://viewfinder.pro/?dataType=Post&page=1&sort=New (same admin, medium post rate)
https://netheads.online/?dataType=Post&page=1&sort=New (same admin, low post rate)
https://healthy.community/?dataType=Post&page=1&sort=New (same admin, low post rate)
https://sfw.community/?dataType=Post&listingType=Local&page=1&sort=New (same admin, no post yet)
https://blockchained.world/?dataType=Post&page=1&sort=New (same admin, low post rate)
https://matchpoint.zone/?dataType=Post&page=1&sort=New (same admin, low post rate)
https://poweruser.forum/?dataType=Post&page=1&sort=New (same admin, high post rate)
https://hi-fi.community/?dataType=Post&page=1&sort=New (same admin, medium post rate)
https://expats.zone/?dataType=Post&page=1&sort=New (same admin, medium post rate)
https://nba.space/?dataType=Post&page=1&sort=New (same admin, high post rate)
https://athletic.center/?dataType=Post&listingType=Local&page=1&sort=New (same admin, no post yet)
https://style.land/?dataType=Post&page=1&sort=New (same admin, high post rate)
https://metacritics.zone/?dataType=Post&page=1&sort=New (same admin, high post rate)
https://academy.garden/?dataType=Post&page=1&sort=New (same admin, medium post rate)
https://foodie.rehab/?dataType=Post&page=1&sort=New (same admin, no post yet)
https://indiehackers.space/?dataType=Post&page=1&sort=New (same admin, high post rate)
https://hardware.watch/?dataType=Post&page=1&sort=New (same admin, high post rate)
https://nfl.community/?dataType=Post&page=1&sort=New (same admin, high post rate)

The instances may be hours to two months old and are run by the same admin. Some have high post rate, while others have no post yet. The ones with posts are all using @alien.top's random bot accounts. I suspect this problem will amplify.

Update2

Blocking by instance is finally working. I blocked @alien.top and @hardware.watch. Consider this issue resolved.