> Am I right in this assumption?

Yes. I tried using Chrome on Linux just to watch movies that I purchased on Youtube at HD/4K and watched as the stream was limited to 240P. IMHO regardless of what Google says in their ToS they have already broken the trust agreement by not providing what I paid for. Regardless of what the studios want, all this does is push me back towards piracy because once again the industry fails to understand that piracy is a accessibility problem, not a financial problem. If I pay for 4K then regardless of where I want to watch that movie it better be in 4K, that's what I paid for. Google hides behind their ToS to get around the fact that they sold me a product then failed to deliver.

> ChromeOS gets 1080p/4K not because it has massive market share but cause the hardware and boot chain are locked down by the almighty Google.

ChromeOS is based on Gentoo Linux underneath just very stripped down and Googlefied. It's the same BS that Bungee pulled with Destiny 2 and Linux. If you so much as dared to run Destiny 2 on Linux you would be banned. Stadia used Linux but because Google controlled the platform they allowed it to be played there.

These are the games they play to make other platforms that aren't MacOS/Windows appear like they are incapable but in reality it's just corporate greed and grift.