Not exactly competitors, but today I mostly use Nebula and CuriosityStream instead of Youtube when I want long-form bedtime videos. Both are paid, unfortunately, but for $20 a year I think it's more than worth it.

As far as I understand, Nebula is also co-owned by content creators themselves. Also, they see direct revenue from subscriptions.

I had no idea! That makes me happy, as I want to support them.

PeerTube exists in the Fediverse sphere. There's Nebula from several content creators on YouTube. I don't know how well your random search would go on either though.

cinnamon.video Obviously not a competitor at it current non existing market share but they obviously are after youtube creators and have a different monetization concept that YT.

DailyMotion is the biggest one I can think of.