I don't think they have to. Fiverr uses Paypal Adaptive Payments and I've bought stuff on there without using a Paypal account. I use Paypal to charge my own c

I don't think they have to. Fiverr uses Paypal Adaptive Payments and I've bought stuff on there without using a Paypal account. I use Paypal to charge my own customers (not using adaptive payments) and I had to upgrade my account to a business account before I could let customers pay without having to have a Paypal account. I'm guessing something similar applies to Adaptive Payments.