Not going to defend Carvana... but most people trust used car dealers about as far as they can throw a full size pickup.

Most of the problems with Carvana are the same problems you get at any used car dealer, just magnified by scale. All of the title/registration problems. Financing. Availability. Communication. No better or worse than any random dealer.

My first car ever (25+ years ago) I received the wrong plate from the dealer. My dad and I noticed it and ran back to the dealer a day or two later. Good thing they didn't give away the plate they were supposed to give us.