[IG_Semmelweiss]

I agree. Yet, I assume professionals (with VPN) would definitely attract more law enforcement action due to size of transfers.

But if you can prevent script kiddies, why not? The current barrier to entry is so damn low. Paying VPN is indeed a barrier to entry.

[reincoder]

I work for IPinfo, where we provide a VPN detection service. Some people think that our VPN detection service restricts access to various services through a VPN. However, if someone is paying for their internet and then chooses to pay an additional $15-$20 a month for a VPN service, it is likely to be a source of good traffic.

From the point of Facebook, I think they use SMS verification and their app also requires location permission. Facebook is pretty good at preventing bad signups. What they need to do is invest that effort in keeping their user base safe.

[nicolas_t]

There are databases sold by the likes of Maxmind to identify a lot of the common VPNs so this could also be detected. Of course it's a game of cat and mouse but still better than nothing.