They do make sense because you are not going to win every time, you can lose all your money just like gambling, investing in casinos is still a gamble, it's not always guaranteed profit and investing all your money can be a terrible idea.
I don't think so. Everyone knows that house always wins in long run, saying that you can lose if you invest in casino means casino will lose, which is only partially correct. Casino will lose in short run, but greed and negative expected value games will make players lose in long run. Investment shouldn't be treated like "get rich overnight" scheme, it is something for your future. Investment in casino is safe money if you know how to find in witch site to invest(crypto-games are one example of good site to invest)
I personally think small investments make sense when it comes to cryptocurrency because 0.01 today can be 100$ tomorrow.
First tell me which cryptocurrency will increase its value from 0.01 - 100$? You will probably waste thousands of dollars to find something like that....if you find it. I am looking at this statement as gambling with altcoins and it is not investment in my opinion.
Bitcoin was worth cents and it's now worth more than 5k dollars. Even tho casinos win long term, you wont. First you have to find a casino that will let you invest in them for a long time, you also need a lot of money to cover losses and you also need the casino to actually survive for so long, a lot of casinos ended or even scammed their users, it's just very tricky to get ahead in this kind of investments and you can't make them small, otherwise your winnings will be meaningless.