Welllll, it's partly people using the all feed, and it's partly some disgruntled people from ai image communities that object to the cross posting.
I have an irl friend that was down voting all of philo's posts until I gave him a blast of shit about it after he ranted about the "spamming". It isn't spam, and it's perfectly okay by the rules of the other communities, but assholes are going to asshole.
The rest may just be idiots, I can't be sure. But every post here is on topic, so it's a total dick move to down vote here.