If you want to have cash in hand within minutes, they offer that too, albeit with a hefty surcharge.
With Bitcoin, you have to pay an on-ramp and an off-ramp because EUR->Bitcoin->CLP, which will be hard to get done cheaper than the WU currency exchange spread (introductory offers don't count, so keep your anecdote). Given current Bitcoin volatility you need to do the currency exchange quickly or you may have a hodl moment and have to wait for Bitcoin to regain its value.
I really fail to see where the great savings from carrying out such a transaction via Bitcoin are supposed to come from, in particular when take into account the number of intermediaries I have to interact with and trust and the technical complexity involved in handling Bitcoin. People are always willing to pay a small fee for comfort and security.