VPNs aren’t supported nor are they forbidden. And you can get banned for one and they’re usually good at overturning it.
One of my guildies got banned for 6 months for one though and even though he provided the logs they still didn’t believe it was a VPN so he ended up making a new account.
He was changing the VPN location mid-game though as he was doing other things on his computer. So that’s probably part of it lol.