All FFLs are required to run a background check by federal law, the ATF will absolutely destroy anyone who doesn’t.
Private sales are private, it’s not a loophole, it’s a compromise made when the law was established.
Sometimes there are private sellers at gun shows, however, a ton of regulation applies.
It is a felony to sell a firearm to prohibited persons.
You can’t just sell guns and call it private. If you’re selling more than a few guns from a private collection you are required to obtain an FFL. The ATF is happy to ram the law up anyone’s ass who is in violation.
Please try to understand the actuality before making assertions, thank you.