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So if more Bitcoin ATMs accept buy and sell Bitcoin then it will easier to cash out Bitcoin for US Citizens. Cashing out Bitcoin easily is a challenging task for me. Especially those countries that do not allow Bitcoin just imagine how hard for them cash out Bitcoin.
In what way do you think cashing out here will be easier than, for example, selling against FIAT on Binance and transferring it to the bank account?
ATMs have very high fees (> 5%) and charge KYC even for relatively small amounts (here in my country starting from $999), so it is very expensive and very troublesome to use such ATMs. Transferring the coins to an exchange, selling them against FIAT and transferring FIAT to my own bank account, on the other hand, costs me hardly any fees and I can do it from home.
In countries where BTC is prohibited there will be no ATMs either way

For me personally, the ATMs are one thing: a great advertising tool to make Bitcoin known to the normal population, but nothing more.