Google doesn't even support webp in their products.

Nobody should be using it. For maximum compatibility there’s optimized JPEG (which one bug doesn’t change), and for good compression there’s AVIF. WebP is an outdated format in the middle giving you neither.

Probably quite a few. Safari didn't even support webp until like last year I think.

Yes, many

Safari itself didn’t support webp until a year or two ago.