Same as everyone else. 'Free' trial required an account setup. Account setup required a credit card. Fine print says that as soon as your 'free' trial ends, you start paying monthly until you cancel. So if you don't proactively cancel, you end up paying until you notice it showing up on your credit card bill.
The quality of the document I got was garbage. I am willing to bet that the majority of their revenue is derived from 'free' trial members who fail to notice the fine print. These paying customers, like me, don't actually use the service. That is, they paying for nothing. It might be legal. But it isn't right. It is a scam.