Yeah but look at the AV1 hardware support matrix. A lot of current mobile silicon supports decode, not nearly as much supports encode. To have AV1 truly replace MP4/MP5 a hardware encode is necessary so you can do video calls in AV1.

The one who could really make this happen is Apple. If they decided to move away from MPEG-LA and embraced open codecs (AV1 / VP9 / Opus / FLAC / AVIF / JPEGXL / JPEG2000), supporting them in software, hardware, and their services (imessage/ichat/facetime, music store, video store) that would single handedly push the industry.

They did that with HEIC- before iPhones switched to HEIC by default nobody bothered with the encumbered format. Now it's become de facto standard. That SHOULD have been something open like AVIF, JPEG XL, etc.