silverpill@alex Many Mastodon users want data portability, so I wouldn't rule that out. But even if Mastodon devs will implement it, they certainly won't be the first.
Right now FEP-ef61 is just an idea. Some parts are not quite elegant, (especially inbox discovery), W3C standards which FEP-ef61 is based upon are unstable, likely this proposal is not compatible with JSON-LD... So there's a lot of work to do (and your input is welcome!).
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