Some people live on $200 a month, so they definitely can't afford to spend that amount on gambling. And by the way, if a player sees that he is not able to win, it would be better for him to buy bitcoin for this money, and bitcoin would bring a good profit even without bets.
Now you are comparing gambling with investment. Of course, investment is far better than gambling. But you have to be careful about where you are going to invest. If you invest in Bitcoin, that is a great asset. But if someone invests in altcoins too, they have to be picky. One should not invest in any altcoins. Most of the alts dump when Bitcoin moves sideways. When altcoins pump, they pump a lot. When they dump, they start to bleed. So, the altcoin investment is nothing better than gambling.
But as you said, Bitcoin investment is better than gambling. But the purpose of gambling and investments is totally different.
You people need to stop hating on altcoins because they are not doing well for now, if you failed to see the opportunity in front that's your problem, but stop discouraging others, the biggest money I ever made from crypto is from alt, they are highly volatile but that doesn't mean you can't make money from them.
Anyone that earns $200 every month can still gamble, they just have to cut their clothes accordingly, I expect someone will such income to use not more than a dollar or two on gamble, and if they don't have family to take care they can use up to $10 on gambling every month.
Its better to go for sport bets rather than casino games and yes they can still buy some Satoshis every month from that amount too, investment is more assured so it can take a better part of the monthly income rather than risking much on gambling.