If someone you know (a customer, in this case, with an existing relationship) wants to keep paying you, why go out of your way to say no?

unless there is a specific reason you think they screwed up - like they say they want to cancel, but hit the wrong button or something.

Or you know they’re dead and can’t cancel.

Otherwise it just inconveniences them if they want it, since you cancelled it out from under them.

Bad business, and probably rude unless there is a concrete reason you have to believe otherwise.