alt Hacker NewsAlcohol is older than recorded civilization, while online gambling has existed for about half of one human lifetime, and has been mainstream for less than a decade. We're watching the negative consequences play out in real time. This isn't prohibiting something innate to humanity; you could still go to a casino and gamble before DraftKings existed.
10 years ago I had some friends who were into online sports betting. It required getting a VPN, accessing offshore servers, signing up for sketchy websites, and linking an online bank account. It was enough hoops to jump through that the average person wouldn't bother. Back then I would have agreed with you: let the people play! But I'm only 33 and I've watched online gambling cripple peoples' lives in just the last few years. It's a huge problem and should be made illegal again. You should not be able to access it in one click from the App Store.
Just like all prohibitions, if you take away access to X, people will just find other (often illegal/dangerous) ways to do X. We can make gambling less convenient and push it back into the backroom poker rooms and illegal bookies who break peoples' legs, but it would be more effective to solve the problems of despair, desperation and hopelessness that are driving people to gambling in the first place. That's a lot harder, so here we are talking about bans.