The more benign version happened to me. Over $1k for an Illustrator subscription that I forgot to cancel and didn't touch for 2 years. No email from them that might have reminded me. When I went to support, they offered me nothing. Say what you will about personal responsibility, but I won't pay for an Adobe product again.

edit: Also want to mention that I used a couple different subscription trackers like Trim, and they didn't identify the Adobe charges. Weird.