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.
I think most architecture design decisions are made by the developers of the fediverse projects. If the 3 Lemmy devs or the Mastodon maintainers agreed to do it… (And it’s technically feasible.) I suppose it could be done.
I mean as long as it works seemlessly and doesn’t violate ActivityPub, we don’t really need a consensus of all the users and admins. We just need the server admins to install the next update.