I’m not opposed to ways for people paying out of their own pocket to host to get some funds to help cover that, but I worry it’ll never be well implemented.
I think a good first step would be a default and built in way for server admins to add a small donations banner listing the hosting costs of their instances. That also does have issues though, of course. The person hosting is definitely putting in the most money, but other moderators and admins are contributing labour too.
It’s a tough subject, and many solutions would be rife with abuse. Shit sucks.