While your iPhone or Android phone plays VP9 natively, many smart TVs (especially older Samsung or LG models) and budget streaming sticks do have hardware decoders for VP9.
It is simply Google’s royalty-free answer to H.265. superman & lois s04e01 libvpx
is an open-source video codec library developed by Google. It is the reference encoder for VP8 and VP9 . While your iPhone or Android phone plays VP9