Security-wise they haven't been really tested yet, but Ethereum moving to a PoS model will be a good case. The only reason they are accepted at the moment is t

Security-wise they haven't been really tested yet, but Ethereum moving to a PoS model will be a good case. The only reason they are accepted at the moment is that it's free money, especially for the initial coin holders(founders/friend investors etc.). For some reason people now accept fully pre-distributed coins. At least Ethereum went through a PoW phase to allow for some non-ICO distribution.