When I buy using F&F I have a phone conversation with the seller, ask for additional pictures to be texted to my cell, check feedback and research the seller including what they do for a living, their LinkedIn profile etc. I also do not sell to buyers with 0 feedback using G&S due to possibility of fraud and chargebacks. And I do not buy from sellers with 0 feedback. I never had a problem. If I do not trust the sellers I either request to use PayPal G&S or don’t buy from them.
I have bought and sold a ton on AG and USAM using F&F without issues.