Perhaps you like this nostalgic TV as well then: https://90s.myretrotvs.com. It also uses Youtube as a source and plays uninterrupted like an old-school channel.
Tmux is great for working together with someone. Syme[1] uses tmux as well, and allows you to quickly program on a GitHub project with others, without setting up a server or needing to add users. I think this is relevant, as it shows the convenience of tmux.
Have a look at https://www.cubby.com/. It syncs existing folders you want to, and per synced folder you can decide to use their cloud or sync directly.