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40,000 is a microscopic number and 95% of them are in USA and Canada.

The countries that could make most use of these crypto ATMs have no access to them.

El Salvador has more than 2000 of them. If people want to cash out BTC, they can. No network access or exchange needed.

How much do they charge for this service? How quickly do they perform the transaction vs. a typical ATM?

A lot! I tried them a couple of times just for fun, the exchange rates were horrible.