Windows 11 will add a watermark if you use unsupported hardware
 

Microsoft isn't just reserving watermarks for unactivated or bootlegged Windows copies. The Verge has learned that the most recent Windows 11 Release Preview build (22000.588) applies a watermark to the desktop if you use a workaround to run the operating system on unsupported hardware. Try it and you'll see a "system requirements not met" notice that asks you to visit settings to learn more. There don't appear to be any feature limitations, however.

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