Because they’re evil, fascist, thought police for wanting to take away our god given right to tell entire groups of people that they’re subhuman on the internet. Unlike those valiant and heroic free speech and freedom of expression warriors that burn and ban books, police other people’s identities and cheer as a handful of conservative billionaires buy up all the free press and social platforms.
Edit: /s just in case.
I think that when I successfully appealed before, I must’ve just caught someone in a good mood. Because to be honest the ban that I successfully appealed was for a much spicier comment than the ban that I was now unsuccessful at appealing. So the impression I get is that it just depends on if the person seeing your appeal is an asshole or not.