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It probably depends on the device they used to upload the video. It seems like almost everyone with an S10 is able to upload in the highest quality while older videos were used with cheaper cameras and phones.
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You should be able to view YouTube videos in 1440P..
You have to go to Settings< Display
Not all videos support it.
I'm looking it up
Most YouTube videos I tried go up to 1080p. There are a few that will go up to 1440p, like this one:
I'm on a note 10+ but my max option is 720