The true test of these things is whether someone who didn't create it can use it. It's easy to use these things if you know what it's actually doing all the way down the stack.
claiming "millisecond compilation times" and then revealing you're talking about recompilations is funny
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy:
Breadtube if it didn't suck.
Post videos you genuinely enjoy and want to share, duh. Celebrate the diversity of interests shared by chapochatters by posting a deep dive into Venetian kelp farming, I dunno. Also media criticism, bite-sized versions of left-wing theory, all the stuff you expected. But I am curious about that kelp farming thing now that you mentioned it.
Low effort / spam videos might be removed, especially weeb content.
There is a cytube that you can paste videos into and watch with whoever happens to be around. It's open submission unless there's something important to commandeer it with at the time.
A weekly watch party happens every Saturday (Sunday down under), with video nominations Saturday-Monday, voting Monday-Thursday. See the pin for whatever stage it's currently in.