Google bots definitely come disguised, to check whether the web site serves different content to non-Google user agents.
There's also the very well known inverse phenomenon of absolutely non-google people trying to disguise their crawler as a googlebot useragent, which has been a thing since at least... 15 years now?
alt Hacker News
There's also the very well known inverse phenomenon of absolutely non-google people trying to disguise their crawler as a googlebot useragent, which has been a thing since at least... 15 years now?