It's near impossible to open an bank account in many countries (specifically developed countries) without residency. I would also expect that if a US bank account was being used the IRS might question about taxes, as payment is occurring in the US, as far as they are concerned?

You can open up a bank account in the US without US residency - but it's more of a hassle than just using a service that supports your country because of tax issues and such.

I'm not an US citizen. I guess that you need a social security number and be an American citizen to open a bank account in the US.