Needed? yes, .. useful? yes, safe?.. of course.. I think the security of an atm will be disturbed if a third party does it. Such as planting third applications and recording devices, of course this can happen if we as users are not vigilant. This really helps crypto users to earn money without having to open a market right? I imagine this is already happening where I am, it's amazing..
Needed? Not necessarily
Useful? It's kind of taking away the main thought of having digital/virtual currency.
Safe? Since there's no physical money stored in that ATM (IF that atm's main purpose is just to transact from one to another, without the withdrawal function. The physical ATM itself is safe).
But the fact that most of the countries are still not fond of Cryptos. Who will create, facilitate and maintain a Crypto ATM Machine?
Having that said, Let's go back to the Safeness of these machines. Most likely the government will not fund this, and only the private sectors in which has the capacity to create and maintain one can. Thus, the anonymity of the Crypto holder be safe? We are speaking of ATMs right, Since the chance, some will access their wallets (main or the other) in this machine/s will be exposed? Why? All ATMs has it's own Camera and this can be penetrated by Hackers.