Assuming a users upvote history or karma ever meant anything, this demonstrates perfectly it's useless on Lemmy.
I wonder if there's a machine learning technique that can be used to detect bot-laden instances.
If we stop spam accounts from brand new or low usage servers those could both be easily mailed (emulated activity, pre-create instances and let them marinate)
I don't know much about how making new instances works, but could someone create instances in large qualities with smaller populations with the goal of giving human moderators too much work to defederate them all?
This would actually be a bit more difficult. So first it would be easy for me to set up lemmy1.derproid.com, lemmy2.derproid.com, etc. but if you could just defed from *.derproid.com it's no problem. However setting up lemmy1.com, lemmy2.com, etc. is more expensive because you would need to register and pay for each of those domains individually.
That's not to say it's impossible but there is a bigger barrier to it.
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;