A competitor that grows to the size of YouTube will face all the same pressures from publishers, legislators, advertisers, and malicious actors, and will almost certainly turn into something that looks a hell of a lot like YouTube does today.
Oh, and since it'll be advertising-supported (Nobody will want to pay $10/month for a significantly-worse to slightly-better YouTube alternative), it'll also be bending over backwards to make advertisers happy... Gosh, I wonder what the likely outcome of that is going to be.
Can you even imagine pitching this to a VC?
"We're going to build a YouTube alternative that doesn't suck, that will piss off major content owners[1], and will be a haven for bad actors. We're going to be amazing, give us money!"
[1] Who will sue us for every cent that we have ever, or will ever own.