Is this true? Very curious new mama.

Is it true that if you do not breast feed at all for whatever reason, that you would still have to pump at first? I saw a post on here a while ago saying that if you didn’t pump to start out that your breasts would “implode” and I’m just wondering if that is true? Or maybe hear some other women’s experience with this please. If this is true, I don’t understand why because if the plan is to formula feed... and you pump just for the sake of pain relief, you’d eventually have to stop pumping anyway so why start? Thank you in advance for whatever feedback I get.