It's already illegal in CA, and I can't imagine laws in other states being significantly different. (let's ignore the idiocy of allowing red indicator lights in the US)
https://leginfo.legislature.ca.gov/faces/codes_displaySectio....
What I think is absurd is red, yellow, and/or blue flashing lights except for emergency vehicles on or conveying to an emergency. Throughout the South US, maintenance vehicles flash zillions of lights creating visual distractions and flasher fatigue.