Idk about "terrified" but they should realize it will affect their income. If the anti-cheat companies start making products that work on it, I’d imagine they could take a disastrous hit.
I suppose you are taking about a laptop ? Some laptops are known to have strange fan behaviors with Linux. I suppose the manufacturers are using a windows driver to control the fans, as opposed to controlling the fans with the Embedded Controller, which would work the same regardless of the OS.