> The encoding still isn't ready for user driven content sites.

YouTube has lots of AV1 encodes. You've probably watched AV1 encoded content without realising it. Here are a few of examples. To verify that they're AV1 encoded, right-click on the video and select "Stats for Nerds". I'm playing them in Firefox 75 beta.

Halo trailer: https://www.youtube.com/watch?v=Fmdb-KmlzD8

Despacito music video: https://www.youtube.com/watch?v=kJQP7kiw5Fk

Porsche Taycan commercial: https://www.youtube.com/watch?v=92sXWVxRr0g

For some videos YouTube has AV1 encodes up to 480p, others are up to 1080p, and some are up to 4K.