And when they get banned they have trouble cancelling their subscription, which is tied to their email account. Apparently to cancel you have to use the plug in from your email account. I think we figured out where a lot of the $115k/mo is coming from. Wouldn't be surprised to see some legal push back.

Why would one use the same email to sign up, and to send spam?!

Because that is how this works. There is so much wrong about this service, this is just another tip of the iceberg.