The other problem is things like DRM being increasingly common. Last I checked, many video streaming providers either don't support Linux, or only serve low-quality videos. With Macs you know they'll get support.
It's because, rightly or not, they don't trust Linux in comparison to MacOS and view it as a piracy vector.
If it wasn't going to get blocked by some prominent factions on principle, I think you could build some trusted web technologies that allowed secure video delivery pipelines. But there's too much of a position that nothing like that should exist from some quarters that it'll never happen.