Crypto trading has more downsides for addicted gamblers, IMHO. There are many ways to find out alternative methods but addicted gamblers can deposit their whole crypto portfolio in one night to chase big wins, it is not a secret for us. Pro sides are there as well but I think cons are more than pros for addicted gamblers on online crypto platforms.
Then I think we could add online gambling in general. Besides crypto casinos, also the fiat virtual casinos. Technology brings accessibility, although it works on both ways, including the facility of losing funds, when the person is out of control playing impulsively. These cases are so serious that it may be necessary for the addicted gambler to stay away from the internet for a while, until he can make sure his addiction is under control, otherwise he won't resist the temptation of accessing one casino or another from the so many of the available options.
The relation between gambling addiction and virtual casinos are indeed much more harmful than between gambling addiction and physical casinos, because when that is the case, it's easier to control the gambler by taking him to an area where there are no casinos available. However, with the internet you can't do this, because it's everywhere!