This is stuff that companies already handle with their current cancellation pipelines. Hooking up a short circuit that flags whatever user in their DB as having cancelled is something that I would absolutely toss a junior engineer at and expect them to finish in three or so working days, maybe slightly longer.

The only way it's more onerous than that is if companies have an absolutely shit design under the hood, or they're using malicious compliance to argue that this feature specifically needs eight weeks of planning poker and at least five senior engineers to sign off on each iteration of the design phase.