Hi Luciev, to answer the question directly we don't ban accounts for using proxies, but we don't support them either. That being said, a Battle.net account can get automatically locked down if it looks like it's being logged into from a new location, but that's easily fixed by forcing a password reset - or by having an authenticator/SMS protect set up on the account. In addition, here's some
general information which may help you alleviate the latency you've reported.
Please let us know if this helped you!
Cheers,
Araxom