I've seen people open up all of their users' "private" content to Googlebot IPs just to get rid of errors in Google's search/Adsense console "in case it helps revenue" (as in they didn't even know for sure if it would help, only that it shows up as an "error" in Google's console and red=bad)
All you need to do is to jingle some real, if small SEO/ad advantage and people will bend over themselves to lick Google's boots.