it's to prevent abuse and fraud. just a fyi: everything you do on your vpn is logged so if you think you're slick then i have some news for ya...gs is always a few steps ahead of everyone so i personally lol at anyone who tries to pull a fast one on them. but i do recommend using your regular isp and ordering from them instead of hiding behind a vpn because they'll never accept vpns again and they'll gladly take you back as a customer. or feel free to shop in one of their retail locations, you can check the store locator and i guarantee there will be at least a few near you.
I'm unsure how using a VPN is used for abuse and fraud but I have always used a VPN in general for privacy concerns and to dl porn torrents discreetly.