> Vanguard did end up banning those people eventually, since it can see what devices you have plugged in.

Only because the makers of those DMA cards do a bad job hiding themselves. They either use vague, recognisable names, or don't act like the devices they're spoofing.

The moment a cheat developer manages to reprogram an actual SSD (especially a common model), hardware detection like that becomes near impossible.

Riot just shipped a new kind of DMA protection, using IOMMU, and they tout that that cheating method is now 6 feet deep.