YouTube TV - Do all channels stream in 4K

I feel most households have at least one 4k tv. I subscribe to YouTube TV. Most channels on YouTube TV only stream up to 1080p with a few only going up to 720p. Some primetime sporting events and a few programs can be watched in 4K, but they seem to be few and far between. Maybe in time all channels will stream in 2k or 4k so we can get the most out of our 4k tv's. Whatever
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