How do botcoin ATMs work?
That would not be possible with Bitcoin. Because the founder and operator of bitcoin was anonymous and no one could know what he was doing. Therefore Bitcoin ATMs will not be available. But I believe in the revolution of Crypto, there will be altcoins doing this to beat the bank of the world.
I hope Hashcard and Credits can do this.
You should have searched first before giving your thoughts on Bitcoin ATM. There's a lot of Bitcoin ATMs all over the world now. The number of Bitcoin ATMs may not be comparable to the regular ATMs owned and operated by a Bank but for sure the number is growing as Bitcoin is starting to gain ground in different countries. Here is a map of Bitcoin ATMs all over the world