5. 'Free' trial offers
Pitch: Try a free offer and never be charged -- unless you want to continue the offer.
Target: Repeated monthly billings.
The free trial offers seem easy. The consumer is repeatedly billed every month, and it is difficult to cancel. You could be left without a way to cancel a service you don't want anymore or don't trust. When you sign up, make sure to learn how you can get out of the service, if you choose to later.