matrix<->mastodon bridge is looking promising, but somewhat blocked on https://github.com/tootsuite/mastodon/issues/2726 if anyone has any ideas (@kevinmarks?)
@matrix @kevinmarks Uh-oh. I can explain why it happens. Might change this behaviour for public toots. PuSH only sends payloads if there is a known follower from the domain where the callback is.