None of the other browser vendors have implemented support for it and all the other browser vendors have supported the comparable AVIF format (which is live acr

None of the other browser vendors have implemented support for it and all the other browser vendors have supported the comparable AVIF format (which is live across the board except in Edge), so this seems pretty much a "noone is interested in this" type scenario. Ecosystem doesn't mean a few fans on HN, in this context they mean "people building browsers".