The best investment for bitcoin is to store it and not to spend it. Storing bitcoin is a great investment and can fetch you a much higher return compared to any conventional investment. Also trading can be a great source of income but only if you know how to play it right. So yes, storing and trading is ok for investment but not p2p or casinos.
Buying and holding a speculative asset is just a form of gambling. It is no better than the casinos you say are a great source of losing money. And bitcoin is not a business. It doesn't generate any profit, so buying it in hopes of making money is speculation. (Same thing for gold, or any other precious metal.) Speculation is the riskiest type of investing, because it is essentially gambling.
Thats a good comment. Just gamble when u get ev+ i would add