I don’t know what a .webp file is but I don’t like it. They’re like a filthy prank version of the image/gif you’re looking for. They make you jump through all these hoops to find the original versions of the files that you can actually do anything with.
Edit: honestly I assumed it had something to do with Google protecting themselves from image piracy shit
WebP is awesome (JPEG-XL is awesomer though). It compresses better than JPEG which was introduced 30(!) years ago. It’s time for JPEG to go away.