It probably goes against the philosophy or whatever of FOSS or Lemmy itself, but why not be a little evil so that you can actually sustain yourself? Donations can bring us far, but small non-intrusive ads can be a bliss in the skies for the people actually hosting the instance. Especially if there are millions of users uploading thousands of images and videos. This is extremely expensive.
Is running ads really that taboo?
EDIT: some people seem not to get the point of “millions of users”, which presumably includes non-techies that do not use adblockers. I mean that without ads (or mining?), no instance would be able to scale to the point where it can compete with Reddit for example. If you were to want that. And not for profit, but solely for sustainability.
Would ads be of much value on a lemmy instance? Almost nobody using lemmy would not be using an ad blocker. And if an instance integrated ads, other instances would have access to their communities without ads unless you do some kind of “native content” scheme where some of your posts are ads which I don’t think anyone would tolerate.
I could see maybe sponsorships with locally hosted shout-outs in the sidebar working for some people.