Bitcoin is just like any casino or lottery - it is a tax on stupid people who fundamentally do not understand that this is a game they will lose. It is tax on low intelligence.
Well for me it's not just a gamble but it has risks , some people say it is but some pros don't believe it instead of arguing on same old *beep*, they tend to just focus on trading and investment, still i drop some link below to somehow expand your understanding if it is a tax or not, for me it's not, but then again i hope it help on future questions and clarification.
Link:
https://www.cnbc.com/2018/02/21/everything-you-need-to-know-about-bitcoin-and-your-taxes.html