

I block them if (f * t - p - e) / q * r passes a certain threshold, where f is the frequency of posting, t is how annoyed I am by the general theme or topic of those posts, p is the cuteness of their profile pic, e is the amount of effort they put into each post, q is the overall quality of the posts, and r is a random number generated by my subconscious.
SearxNG is the only way I know of to get reasonably good results.