Just for reference: in my State (somewhere in Latin America), since 2007, we have a law that TL;DRs to “if you offer a service through a certain mean, you must offer the cancellation method through the same mean; plus by phone, or internet, or snail mail”.

It works like a charm because, contrariwise to what Michael Powell is claiming, customers aren’t such disgustingly stupid trash that will “accidentally” hit the cancel button, nor they deserve to be punished by making cancellation a fucking pain in the arse. (There’s probably similar laws elsewhere.)