WebP never caught on outside of Google's stack:
https://caniuse.com/#search=WebP
When Facebook tried to use WebP a while back their users didn't like it:
https://www.cnet.com/news/facebook-tries-googles-webp-image-...
But these days if you really want to use WebP you can use a WebAssembly build of the library to support it in browsers which don't support it natively:
https://webmproject.github.io/libwebp-demo/webp_wasm/index.h...