https://wccftech.com/apple-tv-youtube-app-is-now-getting-4k-support/

When the tvOS 14 came out, one of the features that Apple highlighted was the support for watching 4K videos in the YouTube app. However, when the tvOS 14 did launch, there was no support for the 4K content streaming on YouTube anywhere. Needless to say, Apple enthusiasts did get upset over this. However, users can now rejoice as Apple TV YouTube app is finally getting 4K support, which is certainly a good thing.

The report emerged from Reddit where a user goes who goes by the name u/vulcan_on_earth reported that the support for the 4K streaming is finally rolling out on the Apple TV YouTube app. Which is certainly a good thing. Other users soon followed suit and we have a thread full of people confirming that they are finally getting the support for 4K streaming on their Apple TV YouTube app. You can check the screenshot below for the sake of reference.