My dvpn, Meile dVPN, has had success in Iran when users use the v2ray protocol. I had an Iranian help me tweak the config with packet fragmentation which splits the 3 way handshake into something like 20 packets. It is proven to work thete.

Doesnt matter if it is 100% banned or made illegal to possess. There is demand for it and when there is demand for something there are people willing to take the risks to produce the supply.