Lemmy is the best-known in that list, but Kbin and lotide both look pretty promising, too - making my decision of which to spin up as a personal instance much more challenging :)
I'd encourage anyone to at least check them out.
Noticing that it's more like HN than reddit, in the sense that there's no equivalent to a subreddit AFAICT. Fine for my purposes, but are there any implications around that when it comes to federating with e.g. Lemmy or Kbin (which very much do have subreddit-like subtopics)?
The idea (maybe not very well communicated in the README and other docs[1]) is that each instance would correspond to a "subreddit" with its distinct community. The federated aspect however still allows users from other instances to subscribe/participate. In my personal opinion building services that group multiple interests is a step in the wrong direction creating redundancy to the concept of federation itself.
[1] https://man.sr.ht/~mariusor/go-activitypub/brutalinks/as-a-r...