Any individual with a internet connection could offer VPN services to their friends. If you are trying to guess location by IP address you will also need to try and detect TOR users, or black list all TOR exit nodes. Also note some ISP's offer IP addresses that are not correctly geo-located, this can lead to false positives and false negatives.

VPN Won't Connect? How to Fix this + other common VPN Problems I can’t connect or stay connected to the VPN. If you can’t connect to the VPN at all, the first thing to … How to Passively Detect VPN Clients on Your Network Dec 05, 2017

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