[blibble]

there's so many ways to detect a hypervisor, particurarly so if you want your VM to be of sufficiently high performance to play competitively

and then there's the statistical methods (measuring anything that causes a VMEXIT is a good candidate)

modern OSes already support the IOMMU (macOS enables it on by default apparently), however outside of that hardware support is patchy at best

ultimately if they're trying to guard the top of the ladder (say the top 0.05%), they could demand you use a certain set of hardware, and the hardcore would put up with it