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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.
No I'm not confusing it. But I'm definitely no expert. All I know is that especially over the pandemic years probably because of lots of family without newer phones at the time though I could have sworn several were. I kept getting lots of complaints about files not playing it all ended up being about h265. So you are probably right.
I am very much not a Microsoft or apple person.