Card churning is a cool way to soak up tons of credit card perks. Usually, the person signs up for multiple credit cards. The kind with multiple perks and then only use them for as long as the perk available. As soon as all the introductory bonuses are used up, they no longer bother with them.
This is a luxury that people with high credit card scores use. That’s because elite rewards cards offer a lot of bonus points if you charge a lot to those cards every month.