By the way, an alternative approach if you just want non-interactive feeds to subscribe to accounts via RSS. Any Mastodon account has an RSS feed which is its normal account profile URL with .rss added to the end.
PeerTube has an RSS subscription option if you click the arrow on an account's "subscribe" button.
Pixelfed supports newsfeeds (but I think they use atom?).
GoToSocial includes RSS support but each user has to manually opt in to activate their feed.