This would be impossible. Orca is rhe most widely used, and many printers don’t ship woth a slicer. Since Orca is FOSS, and there is no sale, there is no way to regulate that.

Firmware on the other hand, is different. The catch is just about every printer can have Klipper installed on it (most just have a modified Klipper already), which, means the law is pointless since it is also FOSS.