Sadly, with these locked down hardware platforms like Xbox, PS, Switch, or even something like an iPhone, the buyer doesn't own the hardware. You're at the whims of the platform holder and what they decide: case in point this story. These platforms, which have grown evermore popular because of their ease of use, are gilded cages. You just noticed the bars.
If they don't give you access to the bootloader and an option to install whatever OS you like, you're beholden to the company.
YouTube hasn't had the same meltdown as Twitter and Reddit, which might explain PeerTube's relatively small scale.
The meltdowns I mentioned brought a lot of attention to their Fediverse alternatives, but YT hasn't really had such a meltdown because Google is somewhat smart and knows not to rock the boat too much lest they have a Twitter or Reddit moment.