Why should the onus be on me to make sure I don't pay more money than I want? I can't stand this 'just subscribe then cancel' mentality. I would like the option

Why should the onus be on me to make sure I don't pay more money than I want? I can't stand this 'just subscribe then cancel' mentality. I would like the option for a one time payment for things without having to fuck around starting and cancelling subscriptions. It's just ridiculous.