When buying crypcurrency, Buffett said, "You do not invest when you do it. You are speculating. There is nothing wrong with that. If you want to bet others will come and pay more money in the near future, it's a kind of game. But that is not investment. " Are we participating in a game?
In my own personal opinion, bitcoin is really a good investment because bitcoin has a potential and good for long-term investment. Even bitcoin do not have a stable price i still would like to invest because if bitcoin decreases badly, it will recover or it will increase again, therefore my money will increase too all you need is patience