I just don't think we should flock over to these centralized options as the defacto alternative.
But, in a way we kind of have to. Barely anyone uses say, peertube, for example. And here I'm talking the mainstream consumers.
Now is peertube and all the other alternatives great for privacy? Yes! Absolutely. Censorship resistant? Yup that too (atleast peertube is) but barely any of the mainstream cares about about privacy, and they simply want something that's convenient.
I mean fuck, if you want a censorship resistent, open source, no javascript service that works on tor etc etc something something privacy, but only 5 videos to watch (massive hyperbole here) by all means use the alternatives. But most users either don't know about the sites/services, don't care or simply find it inconvenient to use and navigate.
I hate to break it to you, but even as an open source advocate, open source alone, doesn't mean it's better automatically; Atleast not for the uses you (the consumer) need to fulfill. Though the argument about privacy holds very much up here, and it's simply better in all aspects in regards to that.
Also many open source programs and apps, and everything in between, that I've come across, lacks basic features, which, atleast for my sake, turns my off almost instantly.