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The procedure will vary per country and per company running the ATM. Some require KYC, some don’t (yet), limits and fees will vary even within the same country. If you’re wondering about a specific country, I’d sate that in the OP so as to get responses more in line with the country’s ATM current procedures.
I think if one company is contracted to handle the ATM it will be better and the charges will be the same irrespective of your country or state hence it is a bitcoin transaction you are making. Like the ATM that is mainly used to dispense fiat currency in my country, the charges per transaction is the same but your charges are increased when you have done more than three transactions in a day. I was thinking the BItcoin ATM will be the same in terms of the charges.