I mostly use desktop to browse and have been using the default shitjustworks site, but someone posted phtn.app above and it looks pretty nice. Discuss.online also looks just like old reddit. Looks like phtn.app works with any instance login.
It’s not an alternate way to view Youtube, it’s a totally separate service. You’re not missing anything, if no one’s using it to post content, then there’s no content. Youtube is a tough one to compete with because the infrastructure needed to host that much data and distribute it is insane. Peertube is super niche and not many know about it, but I do wonder how fast scaling would become a problem if it suddenly got an influx of new users.
This is why I like SomethingAwful forums too. Open since 1999 and an account costs $10. Just a little barrier to entry keeps out the worst people and trolls help fund the site by reregistering!