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YouTube moves to AV1 by default to the dismay of some Android users
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
None of that is going to benefit you if your phone barfs its guts trying to decode it. Until you get a phone with hardware support it's going to be purely theoretical. And if Google forces you to decode 720p AV1 in software when you have a perfectly good AVC and HEVC hardware decoder just sitting there is going to be downright stupid.