YouTube have many competitors and some of them are enormous, such as Netflix and cable TV. Production companies are popping up all the time and are making some of the world's highest quality material. The same for individuals who are making videos.
Or do you mean that YouTube needs a competitor that does exactly the same thing as YouTube?
Essentially, youtube adds more video every single day than the entirety of every other streaming service offers combined.
Youtube is in it's own category, and it's unsurprising no else wants to touch it.
But everybody has to start somewhere. Would it be impossible for Netflix to start adding for example 100 000 hours of user generated video per day?
Providers would be more than happy to sell Netflix the build out
The scales of the two models are very different. Ingesting content is more complicated with user generated content because there's few guarantees about formats (encoding, color, file formats). Serving the content is also more complicated because it's not as friendly to edge caches as studio content. Part of the expense of YouTube is the long tail of content. Popular content might live in edge caches but YouTube serves up old unpopular stuff too.
But I feel a better example of paying for convenience is the Twitch subscriber system. They make it work in a way that others fail at by tying it in to various things like emotes and channel points and the general sense of supporting the creators. I know YT memberships exist, but I don't know how widely those are used and they just don't seem to get pushed as much.
(I think? I'm not very well-versed in Twitch stuff)
I'm someone willing to shell out for SaaS and I don't see nebula being significantly better than just paying for youtube premium (which I do). They have some exclusive content but paying to watch a subset of content ad-free is just not going to work out (on a large scale, I know they're worth like $200m but that's much less than $1t)
Nebula, the answer to the tyranny of Youtube (who works for advertisers), has a <1% conversion rate despite tons of huge Youtubers pushing it. Vid.me, the previous answer to youtubes tyranny, went bankrupt because people hate ads and also hate subscriptions, nor do they donate.
I could write pages about this, but I wish I could violently shake all the children (many who are now in their 40's) that so deeply feel entitled to free content on the internet, and scream "If you are not paying directly for the product, you have no right to complain about the product".
In reality the ad model is not going anywhere. Given the choice, people overwhelmingly chose to let the advertisers steer the ship if it means "free" entry.