5 Trial Accounts Permabanned - Didn't Even Open HB

I created 5 trial accounts last night and created a horde orc on each one. Just tried to login and all 5 accounts have been permanently closed. I never even opened HB. So I believe i was banned for 1 of three reasons or a combination of these 3.

1. The accounts had very similar email addresses.
2. I'm using a V.P.N.
3. They've flagged my MAC address or other hardware.