So does massgrave HWID, difference is that it's free and much more convenient.
If we were talking about KMSpico, I could understand that for just a few euros/dollars you would prefer to not have the inconvenience of refreshing regularly the activation and make sure it's not getting deleted by Windows defender.
But this is even easier than buying stolen keys, it's HWID activation for free. You put some powershell command once (simple as copy/paste, press 1, done), and even if you reinstall Windows. You could wipe your whole system, and it'll still work because it's seen as legit.
Absolutely 0 difference, except I don't have to put my PayPal on some gray market and waste the price of a Monster can.
I genuinely encourage anyone to stop buying those and just use massgrave.dev, I see no reason not to.