An organization called Newsmast is introducing a new approach to decentralized social media with the launch of an updated version of its Mastodon mobile
It's basically that, but with what sounds like some functionality to make them easier to create and find for users of their app/server/API.
The couple I've seen boost my posts in the wild seemed more like bot accounts that just boosted what they saw in the hashtags I used, but it sounds like some of them are probably a bit more curated.