Although I don't anymore, I did use a VPN without issue here for years (it actually used to help with some network issues). AFAIK the rules about VPNs are: there are no rules ... but also, all the regular rules still apply.
For instance, there are ways one could use a VPN to violate the two-boxing rule, but doing so would be a real stupid move. You might even get both your toons up to a decent level before you get caught ... but with a VPN or without, you will get caught, and when you do you'll lose both characters forever.
As long as you don't break any other rules though, VPNs are kosher.
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