Cars with these rims usually have outdoor external speakers on the bottom. So they weaponized the wheels and sound.

It's illegal here in the US too people just don't care.

In the US, what is street legal depends on the locality, most of which is decided by the different states. I heard that in one state, the rule was that tires and rims couldn't extend farther than the side mirrors, and so these people made their side mirrors stick out a lot farther too.