The common challenge for all bitcoin users is: the tremendous amplitude of bitcoin volatility is unstable. The government does not recognize bitcoin and other types of digital money as a means of payment and therefore, all Bitcoin payments in the economy are presumed to violate the law and may be subject to criminal proceedings. The electronic money market is degraded as multi-level.
The common challengers that a bitcoin user faces is the volatility of bitcoin and its very risky as we all know that not all people are risk taker. Potential for theft not by hacking because bitcoin is build through blockchain technology but it is when you left or lose your private key. Also using bitcoin in illegal practices like buying illegal guns and drug or paying for an illegal services.