If someone is taking a loan from bank in order to invest that money into bitcoin or other crypto currency, he surely will be able to make huge money out of that.
Not necessarily. It all depends on the person itself, and the understanding of the market he is investing his borrowed money in. There are enough examples of people having lost their mortgage funds due to bad decisions.
I personally find taking out loans for investment purposes to be the most stupid and mentally retarded thing people can do. Especially in case of a mortgage, or even a second mortgage, you'll be in debt for life if things go wrong.
People only think about the positive aspects of investing, which is just stupid. Investing with borrowed money contributes to you experiencing heavy pressure, mental instability, and to some extent carelessness.
People quite often tend to take more risks with capital that isn't theirs, which is actually weird, because you would expect these people to be more careful with money they borrowed due to the potentially negative consequences.