What is the truth of cheap windows key??

No catch...... Microsoft sell keys in bulk to dealers...  I have many windows 10 pro retail key and working smoothly on windows 11 too.......

But why you need windows keys, as you can use windows without any activation for lifetime free

These Licences are mostly from the Student and Startup Licenses.

They also do know this, but to stay in the Market it seems they aren't taking any actions.

Their main source of income is Microsoft 365, selling OS to OEMs and Corporates.

PS: Better than Piracy 😬

These keys are not meant to be sold to general public, as simple as that. Kind of like those very cheap stuff available in army canteen stores which is supposed to be sold only to army employees & their families living in the area.

@kukdookoo

You guys are using windows

i just use MAS for activation and then use a debloater tool to remove telemetry.

Got genuine win 7 pro key from MSDN ( college sponsored), used the same on two laptops to get 10 pro. Upgraded both to 11 pro now. All free of cost. 

Many of those keys might be bought using stolen credit cards. If detected by Microsoft your account may be terminated.

I would not trust unknown third party sellers for keys. Buy only from popular resellers.

(Or use kmsp*co to activate )