When you understand the basic concept of Bitcoin, you will know that these two things you are trying to compare and not comparable.

If you compare gambling and trading, I will understand your comparison because trading is very risky and you can lose money same as gambling too; but you talk about Bitcoin investment, then you need to take Bitcoin out of this discussion, because Bitcoin is unique coin that gives financial freedom and it store value despite the market volatility.

Some Altcoin investment can be compared to gambling because some altcoin can just die just like that, that is why altcoin investments should be a short term investment.