@hugh According to one dev for GoToSocial:
"Implementing the C2S API is, I'm afraid, really out of the question, as it's totally underdefined, relies on the client to do almost everything, and would be an absolute nightmare project for us. That's a non-starter."
https://codeberg.org/superseriousbusiness/gotosocial/issues/3846#issuecomment-4018586