The licensing is not the issue. It is the middleman charging fees for simple transactions that they will totally skip. Building that before was hard but the blockchain solved that
Facebook may have an advantage on KYC as it already knows it's clients through their facebook activity and so may be able to get the costs lower which could be a competitive advantage there.
What Facebook might know about someone is completely worthless when it comes to KYC. In the country I live there are even some government issued identity documents that won't cut it.