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.
Pict-rs that 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.