And most of them are pretending to be Chrome. If Google had a good case against someone reusing their user agent, maybe they would already have sued?

Or maybe not. Got some random bot from my server logs. Yeah, it's pretending to be Chrome, but more exactly:

"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"

I guess Google might be not eager to open this can of worms.