Windows 2000, together with Windows ME, was the last Windows version which didn't have WPA (https://en.wikipedia.org/wiki/Windows_Product_Activation https://en.

Windows 2000, together with Windows ME, was the last Windows version which didn't have WPA (https://en.wikipedia.org/wiki/Windows_Product_Activation https://en.wikipedia.org/wiki/Windows_Product_Activation), so you didn't have to worry when you upgraded your hardware (not to mention the privacy implications).