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.
I’m guessing that ads/sponsored posts would probably take the form of companies setting up their own Lemmy instances and pays to federate with other instances, and my could-be-unpopular opinion is that it’s fine as long as it’s fair, since if they have to abide by upvotes/downvotes as everybody else it forces the companies to make good contents, and that if they get too annoying/spammy they’ll just get defederated or people will vote with their virtual feet and go elsewhere.
And the good thing about this approach is that you can make sure you get real interactions with real people at these companies for tech support, otherwise the ads would be completely useless.