Your business model doesn't really matter. Users are still have a chance to get a chargeback with almost all payment systems that accept cards. That is why they are unsafe and none of the reputable exchanges are accepting Skrill, PayPal and other similar things.
For everyone who is reading this thread: If you see any not reputable exchange that claims that it will exchange your Skrill / Neteller / PayPal etc. to crypto then there is a huge chance that it will be a scam!