There really aren't that many active peertube channels. Here's all the non-linux channels I could find:
https://piefed.social/c/[email protected] - electronics and music
https://piefed.social/c/[email protected] - general technology
https://piefed.social/c/[email protected] - thunderbird email client
https://piefed.social/c/[email protected] - photography
https://piefed.social/c/[email protected] - climate
https://piefed.social/c/[email protected] - cycling
https://piefed.social/c/[email protected] - transit
https://piefed.social/c/[email protected] - urbanism
https://piefed.social/c/[email protected] - art
https://piefed.social/c/[email protected] - fediverse podcast
https://piefed.social/c/[email protected] - crafting
https://piefed.social/c/[email protected]
https://piefed.social/c/[email protected] - anarchy
https://piefed.social/c/[email protected] - documentaries
https://piefed.social/c/[email protected] - gaming
https://piefed.social/c/[email protected] - comics and movies
https://piefed.social/c/[email protected] - comics
https://piefed.social/c/[email protected] - blender
https://piefed.social/c/[email protected] - krita tutorials