Google reviewers come from any random IP. They don't carry a badge on them like "Google reviewers"....a lot of them work from home and use regular connections.
When you get the dreaded Google visit, that's not the reviewer, that's Google coming in to double check and ban your site. By that time, you've already got caught.
You can still catch those if you can catch stuff like blank referrers and/or cookie them and route them elsewhere, but I dont see those public cloakers doing that even.. which seems so easy to implement
right which is why I would not do any cloaking with those users which have no distinct referrerIt's not easy at all. Blank referer can mean a direct hit. For example I usually type the URL to my favorite sites into the bar, I'm old school. You can't read cookies for other domains so you don't know whether Google or FB or whoever has set a cookie.
A Google reviewer will download a copy of Safari and browse to your site using an unsuspecting iPhone....you can't detect them, simply because they look like a any user.