Fediverse

Short answer: yes. But as with most things the exact mechanism depends on where you're at.

For example most people following my PeerTube account are on Mastodon. Those people see my videos straight in their Mastodon feed and can comment and favourite and boost as normal. Comments and favourites show up on the PeerTube side pretty flawlessly. The videos also show up in a hashtag search from Mastodon servers where I have a follower. Everything just works, it's great for discoverability.

On Lemmy, you can subscribe to a PeerTube channel (not a whole account, as far as I'm aware), but it doesn't seem to work as smoothly. For example here's my channel viewed through my Lemmy instance, lemm.ee. It shows up as a community in my subscriptions list, and new videos show up both in subscriptions feed and in All.

HOWEVER, as you can see there, new videos just sort of stopped federating a month ago. If we view it through lemmy.world instead, there are more recent videos but again not all of them, and some older videos are showing up with more recent dates.

Neither Lemmy server seem to be pulling in comments, just the videos themselves. I've not tested whether comments left here actually make it back to PeerTube.

So TLDR there probably is a way to view them on Kbin as well, I'm not sure what the exact mechanism to search for them would be but do bear in mind federation might not be super slick. If you're on Mastodon though, that's great for sticking all your PT subs into a list and having it all just right there.