You can't buy/use an OEM license for windows on a box you build yourself can you? The last windows machine I put together, I paid > $100 for Windows itself.
Except an unactivated Windows, once past its trial window, will shut down after an hour of use, without warning. That's very annoying.
MS absolutely does enforce activation. They likely won't come after you for using cracks (unless you have hundreds of corporate machines using them), but they will make your life awkward remotely, as they are entitled to by the EULA.
You just can't change the wallpaper away from black, and there is a notice displayed on it.
> Except an unactivated Windows, once past its trial window, will shut down after an hour of use, without warning.
Only LTSC Evaluation version gonna do that.https://www.microsoft.com/en-us/Useterms/OEM/Windows/10/UseT...