Nothing can harm you until you give them the privilege to do so. It's not necessary what has harmed us so much, but gambling is a super quick process and BTC investments took more than a decade for the earliest investors to unlock the true potential value (jackpot prize) of BTC. Gambling gives quick results and needs luck, whereas BTC investments need you to hold for a longer term for it to grow (or lose) its value. So comparison of both isn't possible.