From the previous record bitcoin hasn't destroy any fortune or even make people poor but bitcoin has always been rewarding long time holdlers unless those who choose bitcoin to be a short time investment for them, trading bitcoin can make one losses their money this is where i can agree with you that bitcoin can make one loss their fortune.
If you are investing in BTC you shouldn't have it in mind that you are going to get rich because bitcoin doesn't guarantee this, and this mindset could also make one to invest outside there discretionary income and wouldn't be patience enough to hold for a long time while they may also likely to sell in lost, so i think this is the only way bitcoin can get one to be bankrupted.
It is the way people understand bitcoin that leads to the lose of one fortunes. If bitcoin is an asset and people invest in it and end up making profit by luck this is when bitcoin can be considered as an asset that people lose their fortune. The understanding of every individuals determines what they earn from bitcoin. If one understands bitcoin better their is good tendency of getting a better outcome from it and if the understanding one has is very shallow it can even make one to lose everything they have. People needs to develop a better understanding because this will make one yield good results.