Not all companies do that.

There's a certain vendor that requires me to place same-day orders by a specific time. You can easily place an order from the website. If you need to cancel one, you have to ignore the grayed out cancel button and call their cancellation support line. There you'll talk to an agent that doesn't have access to cancel orders, so you have to convince it that it can't help you before you can transfer to a real employee with the ability to hit the "cancel" button.