The $5 Windows keys have never been legitimate - either they’re just people selling keys they’ve generated with a keygen or bought with a stolen credit card, or it’s students reselling free keys they’ve got from Dreamspark or a sysadmin selling keys from their employer’s enterprise licence, which, in Microsoft’s eyes, are all piracy. An OEM copy of Windows 11 Pro is about €150 and can’t be transferred to a different motherboard, and a retail copy which can be transferred is about €300. A one-time purchase copy of Office is about €120 (it’s also available as a subscription). These machines either have at least €270 of software on them, or €0 worth of pirated software on them.