Disclaimer: I wrote this article and made this website.
There was some talk of this issue in the recent fediverse inefficiencies thread. I’m hopeful that in the future we’ll have a decentralized solution for file hosting but for now I deeply believe that users should pay for their own file hosting.
Have you considered providing something like this: https://jortage.com/ and maybe contribute to their efforts to develop a specific API for that? Source code is here: https://github.com/jortage
Jortage is a really interesting approach. It definitely helps reduce the impact of the file hosting problem but it doesn’t fully address the underlying cost issue. The cost of storing files grows every month indefinitely while donations typically don’t.
I would like to see a file hosting pool come to lemmy though. So I will look into it. :)
Pict-rs that is used by Lemmy to store images already supports S3 type storage, so in theory it should work with Jortage, but I don’t think anybody has tested that yet. The people behind Feddit.org might have experimented with it as they expressed interest a while back.