Currency creators have not used their governments to brutally destroy crypto currencies because they are not credit systems. Aside from mining, cryptos like shares, gold, or any other asset are purchased with currency.
Creating credit, on the other hand, brings one in direct conflict with those with the power to inflate currencies.
Inflation that hands them trillions of dollars annually in purchasing power at the expense of the resultant decline in the value of savings and wages. Empowering them to causes wars, destitute, dispossess, and enslave.