I'm surprised that Vimeo hasn't decided to take advantage of the enshittifcation of YouTube. They have been a social video platform for years, and are probably the best placed platform to come close to overtaking YouTube - should they choose to move away from the professional space and embrace the social aspects of video.
Honestly, Pornhub has the infrastructure to take on Youtube, if they wanted. If they just cloned the site, sans content, and called it Videohub, there would immediately be a real contender in the marketplace.