NPR wrote in 2018
The Federal Trade Commission says they're [Warranty voided if removed labels] illegal.
- Are "Warranty voided if removed"-labels illegal?
- What, if any, is the practical effect of removing the label?
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They are illegal under the Magnuson-Moss Warranty Act. ifixit has a great writeup, with all the sources, including the FTC: https://www.ifixit.com/News/11748/warranty-stickers-are-illegal
Unfortunately, in practice, currently No
Unlike Lemon Laws for cars, the act does not have cost-shifting provisions. If GM doesn't take back their 20K lemon and you sue them and win, all your costs will be paid. Because of that, lawyers will take the cases for free and manufacturers settle quickly(because dragging out a case they know they will lose, just increases their costs when they do). If Apple doesn't honor their warranty on a 2K laptop and you sue, you will win, but Apple will drag it out for years, you will pay 100s of thousands of dollars and all you'll get is the cost of the warranty.
A law is only as good as it's enforcement.