When their world revolves around feels, emotion, “common sense*”, and education is portrayed as bad, they are far easier marks than someone who views un-vetted and too-good-to-be-true opportunities with a logical eye.
*common sense is just another substitute for rejecting actual education and knowledge. “This is the right thing to do because common sense feels right” rather than investigating and making sure of what is right.
Some states require front plates.
Blocking a plate with a bike rack isn’t a bad idea, except - a) the rack will wear your paint, b) any automated toll collection based on license plate reading will also be blocked. Probably NBD once in while, but if someone regularly skips tolls and is caught it’s gonna hurt. They just had a toll-skipper sting near me where they caught a crapton of people who regularly skipped tolls with license plate blockers and temp tags. They lost their cars instantly, a few got slapped with 6-figure fines and fees, and I imagine jail time might be on the menu for some.