We have to apply some weight to the fact that one is open, one isn't, right?
EDIT: Oh! Of course. AVIF is based on AV1. For some reason I was thinking HEIF the entire time I was reading the article. Man... withdrawn!
Really good read, btw. Very good points.
AVIF is royalty-free, & SVT-AV1 and libaom are open source.
Edit: saw you corrected. Much appreciated!
Both are open I think.
AVIF _is_ AV1 in the HEIF container.
(.heif is sometimes used as a file extension generically, but HEIF is itself a container that can support various payloads.)