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JPEG XL: How It Started, How It’s Going
(cloudinary.com)
This is a most excellent place for technology news and articles.
I don't know about AVIF, but WebP is a Google format, and they might be doing it for control, like they use control of Chrome to push more advertising.
Google is also a member of the AOM, which created the AV1 format, which AVIF is derivative of - if you're wondering why they're pushing AVIF.
Avif is pushed because it's good and has hardware support across the board