No. You don't have to be a Qeld customer to apply for a business credit card. The Qeld VISA is available to all entrepreneurs who are registered with the Dutch Chamber of Commerce with their company and whose owners are registered in the Netherlands.
The card is a smart addition to your current financial tools and does not replace your bank account. So you don't have to change banks or open a new account. With the Qeld VISA, you get the flexibility you need without unnecessary bureaucracy.