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.
Lots of bangers. Uplifting clips of kids seeing through American propaganda, and genuinely heartwarming moments of cross-cultural learning. 
You guys gotta stop calling it RedNote, okay? If we're doing this even partially as an F U to our own US government, you've got to start calling it Little Red Book or just RedBook!
iPhones can't do APK downloads I think they're locked down to the app store apps unless you jailbreak them
The format for iOS is called IPA. Unless you are in the EU and have iOS 17.4+ (which obviously isn't the case for Americans), you have to either buy a $99/year developer certificate so your apps don't expire for a year, or deal with solutions like AltStore to handle the fact that your sideloaded apps not from the App Store are going to expire after just 7 days (not to mention the fact that there's a limit per Apple ID)