@threelonmusketeers@hendrik This is how many Fediverse microblogging systems currently work; they serve the Mastodon API for client to server (e.g. app to server) interactions. GoToSocial doesn't even provide any user interface; you use it from some app originally designed for Mastodon. Why? I think because Mastodon's HTTP API is simpler, better documented and well-tested compared to something like ActivityPub's Client-To-Server API.