Just a PPL, and part owner of 2 aircraft, a 1960/64 wood-and-fabric rebuilt over 30 years ago from 2 crashed aircraft, and a 1967 metal one.
There are passengers and passengers.
I wouldn't fly into the hills with an "innocent" trusting passenger. But I've done do with a pilot passenger able to assess the risk, and who suggested it.
I can see an argument for marketing such flights to enthusiasts, in a way that ensures they know about the aircraft and it's flight crew.
But NOT denying everyone the right to the experience.