My calendar is littered with the occasional "Cancel Wired subscription", "Cancel Amazon Unlimited", "Cancel Fitbit premium". This is a standard promotional offer, and it's trivial to not get bitten by it. We have the technology to set reminders for future dates.

It's not trivial for me. All my life I've struggled to attend to scheduled events that are not regularly recurring. I've missed midterm exams in college. I've missed band gigs I was scheduled to play in. I've accidentally stood people up in social outings. I've missed credit card payments. (solved that one with auto-pay) I have calendars and email accounts, and they usually work, but sometimes I miss the notification or forget to check the calendar.

For me, if I was going to plan to cancel something in the future, then instead of scheduling it, I'd just do it now before the thought goes out of my head.