It is lack of central payment system which could lead to people being financially harmed, In Bolivia they banned BTC because cryptocurrency are not issued and controlled by a gov't or unauthorized entity are so called illegal. In Ecuador they building electronic cash system, so they feel the need to protect their new currency from something clearly superior. A decentralized currency of finite production that cannot be manipulated by Gov'ts or banks might dim the lights on their new program in the eyes of the public, which offers non of those benefits.