Problem is it just takes a lot of resources to police, more than the fine revenue. But with CCTV and computer vision it's getting increasingly cheap.
Unfortunately, the US and many other countries have chosen the other path (sporadic enforcement with severe punishment) largely because it's easier to implement. There's a lot of momentum to change this but it's politically difficult at least in America.
The barrier in the US isn't cost. It's a right to privacy and a culture of distrust of government.
But I think the shenanigans of ICE are making people more aware of the importance of privacy. Look at the backlash Ring (lost dog superbowl ad) and Discord (age verification) and Nest (Guthrie case) received just this year.
It really seems to boil down to whether these types of people can be effectively sold on the virtue of tearing down the barriers of privacy and government. If they aren’t already implicitly sold to that then all it takes is for the powers that be to do a better job at marketing their initiative.
No one breaks the rules intentionally anymore.