Really? Why compare it to an ATM? That doesn’t even make sense. An ATM gives you cash, while a slot machine eats your cash. Totally opposite ... 
He is comparing it with ATM machines because they are like ATM machines in the way they are installed and as the world is going, anything is possible. If the slot machines are not installed where he said before outside casino house but now installed where people are enjoying themselves, that makes the question good in my opinion.Someone even mentioned that it was something that has already happened and the world has progressed passed so, but they forget that if cryptocurrency is really to go mainstream, then this is actually still possible because Crypto casinos can still establish this, and people can still use their cryptocurrency to play in these machines.