These are not legal for sale or use in Illinois. Yes, even clear covers.
(Source: P.A. 101-395, eff. 8-16-19.)
“Registration plate or digital registration plate cover” means any tinted, colored, painted, marked, clear, or illuminated object that is designed to (i) cover any of the characters of a motor vehicle’s registration plate or digital registration plate;
(625 ILCS 5/3-413) (from Ch. 95 1/2, par. 3-413)
Sec. 3-413. Display of registration plates or digital registration plates, registration stickers or digital registration stickers, and drive-away permits; registration plate or digital registration plate covers.
(g) A person may not operate any motor vehicle that is equipped with registration plate or digital registration plate covers. A violation of this subsection (g) or a similar provision of a local ordinance is an offense against laws and ordinances regulating the movement of traffic.
(h) A person may not sell or offer for sale a registration plate or digital registration plate cover. A violation of this subsection (h) is a business offense.
(i) A person may not advertise for the purpose of promoting the sale of registration plate or digital registration plate covers. A violation of this subsection (i) is a business offense.
In more places than just Illinois.