2) which better to buy legal things Bitcoin or Normal Bank system (PP,payeer,cash ,.............)
I have never used Bitcoins to purchase any contraband, but I have heard about guys purchasing ammo and drugs from various dark market sites using Bitcoins, or other anonymous currencies such as Zcash and Monero. Obviously it is better to use Bitcoin when compared to Paypal or Payoneer, due to its anonymity. But the most anonymous form of payment still remain in the form of physical cash.