Isn't the whole point of AV1 that it's royalty free, as opposed to H264/265/etc?
Yeah, and the main problem with HEVC/H265 is the patent encumbrance. Very odd, but hopefully it's just coming a bit later.
It started like that. But now there are at least 2 different patent pools that want rent.
For the codec, sure. But there can always be more restrictions on the IP block, driver code, etc.