

1 - You can block/ignore entire instances. (spamming ones)
2 - If it gets big enough, you’ll see legit instances band together and federate only among themselves (white-list, invite only to allow federation)
people will gravitate to these groups of instances if they are well moderated and keep that crap out.
It’s so scary that the top line is an AI response now in google.
Lazy unaware people will just assume its correct,