> More often than not, the first thing I do when I sign up for a service is cancel it (after confirming I can use it for the billing period).

That's what I loved about Apple controlling their App Store subscriptions. All subscriptions keep working through the billing period and there isn't really anything an app can do about it. It also gave me an easy centralized place to view and cancel subscriptions.

Apple got smart on at least part of it and if you cancel a free trial/bonus for buying a thing, it cancels immediately - not at the end of the trial.