Earlier quoted context omitted.
Gold is speculative, stocks are investments. Bitcoin is speculative. https://i.imgur.com/AltAcnB.jpg Keep in mind this graph is logarithmic in scale.
You think stocks are not speculative?
If I take that same money and invest it in a business -- the business is going to take that money and create something new. Hopefully what it creates will be worth more than what you invested, but in any case your investment has changed the world in some way.
I think a cryptocurrency is probably something in between that, because your 'investment' is actually ultimately going to miners who will expand the network, so you are actually building something new in a sense by investing in cryptocurrency. However I'm not sure that building the bitcoin network out is a net positive for the world.