JPEG XL is similarly an algorithm that's been published, but Google removed it from their browser and Mozilla followed suit, which effectively killed its usefulness as a web-friendly (and, more generally, usable-anywhere) format.
Fair enough. What I meant by this is that, in the end, most software that decides to add webp support is doing it because of the huge push by Google to do so. But if they suddenly change that push to something else then webp might find itself growing more irrelevant.
WebP is basically a single i-frame from the WebM video codec, which literally was developed by Google to avoid paying license cost for H.264. For which they had great incentive.
WebP is to WebM what HEIC is to HEVC.
You can argue that using free codecs is a collateral benefit here, even though Google did it for selfish reasons. It is not detrimental to the public or the internet.