And by control you mean trusting a mysterious third party who developed this whole thing, then trusting money changers to convert your fiat money into some kind of electronic form, then trusting the exchanges to not just disappear with your money or bitcoins, then trusting that the difficulty never gets so low that a real blockchain attack could through the whole thing into disrepair, then finally trust that a vendor who accepts your bitcoins won't just vanish with them because you cannot prove that your bitcoins went to someone else (yay anonymity).