Just was told I got banned for 14 days. I got a list of possible reasons from Blizzard, but no specific reason. Did not do anything illegal and I am a steady customer (DIII+exp, SC, SC2+exp). This is really insensitive from Blizzard during times where people get a lot from gaming at home. You need to reconsider your policies because they are hitting the wrong people.
A 14 day restriction is usually due to VPN usage, which unfortunately was a tool used by chat spam bots a few years back to dodge restrictions. The blanket fix for the spam problem was of course to restrict any connections that were routed through a VPN. If you do use a VPN client, make absolutely sure that it’s turned off before playing Diablo 2.