Hello. The post you mentioned was made as a warning, to prove a point. That the fediverse is currently extremely vulnerable to bots.
user ‘alert’, made the post then upvoted with his bots. To prove how easy it was to manipulate traffic, even without funding.
see:
https://kbin.social/m/lemmy@lemmy.ml/t/79888/Protect-Moderate-Purge-Your-Sever
It’s proof that anyone could easily manipulate content unless instance owners take the bot issue seriously.
I can think of a way to help with the problem, but I don’t know how hard it would be to implement.
Create some sort of trust score, where instance owners rate other instances they federate with.
Then the score gets shared in the network. Like some sort of federated whitelisting.
You would have to be prudent a first, but not do the whole task yourself.
You could even add an “adventurousness” slider, to widen or restrict the network based on this score.