That’s not entirely true. I am a big fan of Curve but it’s important to know that if you’re in the U.K, you lose any protection that would normally come from Section 75 of the Consumer Credit Act. This is important for some people/transactions such as flights, where an airline could go bust after you purchase the ticket, before you fly.
I know that Curve can use the MasterCard chargeback process. But being covered by a private company policy is not the same thing as being covered by U.K. legislation.