@tony @neil At the end of the thread, someone mentions it got stalled for years. There's no prioritization by the Mastodon project. Another ActivityPub project, GoToSocial, went ahead and implemented it, although client support for the option is spotty.

Mastodon could at least make it so blocking someone hides their reply, when viewed on your own server; that fix was already written back in 2022, and they refuse to explain why they aren't shipping it. https://github.com/mastodon/mastodon/pull/18468