Earlier quoted context omitted.
It's not like someone will force you paying without your consent. If you don't want to give random apps your credit card, don't give it to them. Why do you oppose other people's right to do that, if they need it?
They're saying > given that I want to use and pay for a piece of software, I would rather pay through Apple and you're saying > if you want to pay through Apple, then don't use and pay for the piece of software
Meanwhile other people may choose to do something else, e.g. because they would rather that more of what they pay go to the developer (where it's plausible that it be used to improve the software) than to Apple (which can't productively use any more money than it already has). And who are you or Apple to get in the way of this transaction between two independent and consenting third parties?