If your software cheat gets detected, which has much lower odds of happening for some games than it does for others, you spend $30 buying a new account. That is much cheaper than spending $500-$2000 on a DMA card and then an assload of money on the actual cheat software that uses that card (because DMA cheats are much more expensive).

I promise you there's at most a single digit number of people using DMA cheats for Rust, because software cheats are more than sufficient to evade the bog standard EAC they use.