I run a message board that has been around in various versions since 1999.
In the past 18 months or so I have noticed that a lot of sign ups are spammers. In fact they are spammer bots that apply for membership on vB and phpBB boards without any human intervention. Once they are signed up, the bots post a spammy message on various forums.
Since I review each sign up for approval, and can view their IP address and email address, I normally catch them before they try to push Viagara and asian porn clips on my membership.
It seems that there are all kinds of free email services that these guys use for the email address and I have a ban list of over 250 but I have never seen a spammer use a gmail address to sign up to my board.
So, does Google not allow someone with a Russian/Eastern European IP to sign up?
BTW, the subject of my site is a particular football team as in American Football so with the exception of a few Brits and German members (and a Dane) the membership resides in the US. Hence I can use IP info to weed out nefarious activity.