SourceHut is not proprietary. It is 100% free software (mostly AGPL) and provides tools to migrate your data between hosted or self-hosted instances.
(Again, to be clear I'm just playing devil's advocate with the semantics. I personally don't believe that sr.ht is doing anything nefarious.)
This is not a guarantee until it is challenged in court or audited by some trusted auditor.
>This take also seems especially outlandish considering that the context is comparing SourceHut to GitHub, which is very clearly more proprietary even in this awkward sense.
No disagreement there.