We wouldnt ever build anything for you to ban customers (or users). Customers = users and there’s tons of wordpress user plugins to ban people.
Personally, I like BuddyPress, so I just mark account as spammer then nuke the IP through a firewall. It will not stop everyone, only idiots. If the person is really a scammer with an IQ over their shoe size, they can get a new IP and account pretty easy. 😉