Well, yes. Hundreds of people in CA had their cars literally crushed. Cops would pull people over and open their hoods and if they saw something illegal then they would haul the car off to be crushed and fine the drivers. Luckily that doesn't seem to be happening here (yet). The ominous cloud of CARB is still hanging over our heads and that could start happening at the whims of our leaders.
Right now it seems that the enforcement is happening on the service side. Businesses are being fined and issued warnings etc like
@nuclearlemon has said. I know of a dyno shop in CO that has been getting weird calls since 2018ish where people would call up and just start asking "will you remove my cats, can you delete my emissions equipment?" and very pointed questions like that and when he tries to talk to them about their goals etc their responses show they obviously don't know anything about cars but are just fishing for something illegal. It got to the point he was getting multiple calls like that a week.
They used the excuse of going after "street racers" but really they did it to as many modified cars as possible. Still goes on to this day. Recently a there are a bunch of videos going viral of CA cops pulling over 100% stock, unmodified, sports cars and inspecting them and issuing fix-it tickets.
So yes, it's happening to thousands of people. Maybe not in CO yet, but I wouldn't be surprised if it starts.
"It won't happen to me, I drive a 4x4" is a bad attitude to have also. Guess what, if you put 35s on your truck then your emissions are going to go up.