Workstation hardware can be used for desktop gaming and any PC can be used for workstation tasks. There's no good reason to treat them differently under the law when the specifics of how they're different are very arbitrary.
Marketing is marketing, any PCs intended purpose is whatever the owner chooses to use it for. I play games on a xeon machine with ECC sometimes. The distinctions between workstations and "gaming" PCs are arbitrary and superficial and no one should be misled into thinking otherwise.