To be fair, Amazon one click purchases got me once. The principle that no one button should cause a "dangerous" action (i.e. one where you can't escape or undo it easily, and especially with money and data) is sometimes violated when the action is only "dangerous" to the user and beneficial to the provider.

Usually the result of clicking such a "dangerous" button is the user gives the provider money or data. It's not common that the provider makes it easy to one-click-no-confirm a process that gives the user money or the provider's data.