Yeah there is a complete section of Vpn stuff. All those posts and threads where form 2017 when i believe it was allowed.It does tell you right on the order page that they are not allowed.Here is what it says......
If our system detect that you are using your donation through a VPN, Proxy, Datacenter or in more than 1 device at the same time it will be automatically banned. When using MAC Address authentication is highly recommended to protect your donation by activating the Country or Internet Provider lock to prevent that someone else spoof your MAC to get unauthorized access using your account.