It’s very similar, part of the “threadiverse”, Fediverse services intended for Reddit-like UIs, like Lemmy and kbin/Mbin. Both use ActivityPub so you can read&post either on either.
They both have their pros and cons. Piefed has better moderation tools, multi-communities, and combines crossposts, among some other things; downsides, it’s written in Python which is… weird, though early metrics suggest it uses less resources. Lemmy is more established, has better app support, and is written in Rust, which, prestigious. But honestly, a lot of it comes down to community and politics.
There’s really strong diminishing returns in healthcare. Improve hygiene, chop away obvious cancer, a dozen other simple types of surgery, and basic meds in obvious cases? Stuff like that probably gets you 60% to where contemporary best practice is, for 5% of the cost. Autonomous LLM doctors would fit in great here.
And in developed countries, a medically trained LLM as a “second opinion” is IMHO an excellent use case of the technology. Provided the doctors managed to maintain medical thinking, keep up to date with their own knowledge, and bother to look into patient histories to the same degree as before. Which is a big if, they’re only human too.