the mania reaching a fever pitch earlier this year with a-listers including matt damon, reese witherspoon, helping build an army of true believers. those celebs now facing criticism after amateur investors, some who poured their life savings into the unstable investments are facing mounting losses. take, for example, the largest cryptocurrency, bitcoin, back in january one bitcoin would have cost you more than $47,000 but today it's worth less than half of that. plunging by a staggering 25% in just the last week. other cryptos like ethereum facing the same fate, slammed more than 70% this year. as risky assets become less popular amid a market selloff -- >> it's highly speculative. it is not appropriate for the average investor. when the market started to go down people kind of panicked, so they started to sell and that's kind of what happens. >> reporter: one of the largest crypto lenders celsius networks temporarily freezing customer withdrawals preventing customers like mike washburn from getting his money back. he has $100,000 in a celsisus account he now can't access. >> i couldn't s