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The mastodon server I joined in 2022 is shutting down permanently. > Please note that Mastodon can move your followers, but it can’t transfer your old posts or uploaded media to your new account. If you want to keep a copy, download an archive. Yeah totally similar to atproto 🙄

Actually you can use the SLURP tool to move your archive. Many friends have done so, moving Mastodon and even Pixelfed accounts over to GoToSocial while preserving their entire archives: codeberg.org/vyr/slurp But yeah, I'm the first to admin ATproto is far superior at this

Correction: "ActivityPub uses URLs as post IDs" –  it would be more precise to say that current implementations do so. I believe this is not totally an inherent limitation of the protocol, as it actually only requires URIs, so DIDs could in theory be used like in ATProto. I may be wrong here though…

There are proposals and some niche implementations that allow content portability, but they're not the most popular implementations

ActivityPod and Holos Social come to mind as solutions.