I just realized maintaining a mailing list is super easy using sr.ht. E.g:
https://lists.sr.ht/~sircmpwn/free-writers-club/ https://sr.ht/~amolith/book-club/
Mailing lists feels like a minimalist and simple form of forum that immediately filters out the junk of noisy social media.
Are you subscribed to any non-dev related mailing lists?