Many credit card companies are headquartered in Delaware because that state doesn't place any limits on interest rates for credit facilities, iirc. States don't always negotiate well and may opt to enrich themselves at the expense of consumers in other states. This is a problem with letting the market dictate solutions; more often than not, things will tend towards a lowest-common denominator, and the financial incentives for firms, consumers, and states are often perversely aligned.

https://www.forbes.com/sites/clairetsosie/2017/04/14/why-so-...