A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Mastodon doesn't just use storage for local image uploads. It pulls, thumbnails and saves images from any incoming posts, including the thumbnails you might see on website links (pulled from the opengraph data most websites implement)
It's possible to set a pretty short timeout for that data though.
Just to validate my thoughts. Could the server, fetch the remote image, duplicate it onto a hosting service, grab the link, and replace the "pulled" image's post with the hosted link ?
I guess it could if you knew how to program that. But I'm wondering what is wrong with the idea that I'm not thinking about.