Mastodon could become that. But, it would need to add some new features.
Mastodon has "editable posts". Which is great.
But Mastodon doesn't give you a "choice of home-feed algorithm" yet. Currently, Mastodon only support reverse-chron as its home-feed algorithm. (I.e., what some inaccurately call "no algorithm".)
And, Mastodon doesn't yet given users the "ability to moderate replies" to their posts.
@reiver@reiver ⊼ (Charles) 
@ezeno789ekZepp_Pf we do have the ability to moderate replies built into ActivityPub, though.
Every object has a `replies` collection that is owned and managed by the creator of the object. If you don't want someone's reply to appear in the list of replies, you can remove it.
Mastodon does not surface this feature. It also doesn't show the `replies` collection remotely. That's too bad; it would cover most of what people want from replies management.
If you have a fediverse account, you can quote this note from your own instance. Search https://cosocial.ca/users/evan/statuses/115719436925042898 on your instance and quote it. (Note that quoting is not supported in Mastodon.)
