If I had to guess, the OP's payment method is specifically what got flagged, resulting in the domain being blocked.

See https://community.cloudflare.com/t/domain-not-working-after-... where someone who appears to the be OP mentioned that CloudFlare auto-refunded some charges.

CloudFlare should still post a public postmortem as to how this user got wrongly flagged (excluding any personal info). The OP has already consented to this: https://news.ycombinator.com/item?id=31574656