If you're talking about doing the playback on Ubuntu, you lose the high-definition. I guess it may not be important for you, but I expect someone who sunk a fair amount of change on a high-end TV to care.
What is meant is that services explicitly short change Linux users by restricting resolution based on client in a fashion that isn't trivially circumvented by fudging the user agent.
For instance a given content may be available in glorious 4K only via an app on a TV, 1080p via a windows or mac machine, and dogshit 720p that actually manages to look worse than old SD on Linux.
This is basically true of every service with Youtube TV being the least bad and showing at least reasonable quality. In theory showing lesser quality streams to less locked down platforms is supposed to make piracy harder. In reality popular shows are always available same day anyway.
Ultimately if you want creators to get paid and to enjoy the highest quality on Linux you need to both pay for and pirate the content and watch for instance on jellyfin.
YouTube TV is a cable replacement service and costs around $70/mo last I checked. It has all the network and local tv channels as well as the usual hbo/showtime/espn/etc packages for an added cost. TV guide, DVR, multiple streams, etc.
Youtube has the video service with cats, puppies, howtos, reviews, and conspiracy theories and YoutubeTV which has live TV, as well as movies, and shows. It is the latter which is artificially limited on Linux but LESS so than for instance hulu or Amazon.
In case any confusion remains these latter are available at tv.youtube.com with a subscription.
It's a cheaper version of a cable package that can be used by up to five google accounts that might not share the same physical household. EG a subscription with multiple premium channels and a good range of channels available in two households could easily be $400-$500 not including internet. YoutubeTV for a similar range of content would be ~$100.
The purpose of youtube for most consumers is to consume video content. Much of the professionally produced video content is TV shows and movies which obviously remains popular. This includes by reference content originating from a range of platforms HBO/Showtime/Starz/Paramount/AMC and so forth
EG you select HBO and Showtime as part of your package and can view the same content as is on MAX or showtime in the singular unified youtubeTV interface. Kind of a mixture of TIVO and netflix with a better interface.
The content providers will refuse to serve the video to you without DRM, attestation, HDCP, whatever new crap some MBA came up with to justify a paycheck to some other MBA…