Investing to reputable online casinos is better than gambling on those casinos. However, regarding your take that there are almost no risk, I disagree on that because there is still a risk in investing to these casinos unless you regularly invest for a long period of time - that way house edge is at your advantage.
I think the risk is actually quite high. Not only there are quite a few bad actors out there, you also have to keep in mind that even though over many bets the return on investment is positive, there may be wild fluctuations that can lead to a significantly negative ROI in the short and medium term.
So if you invest in online casinos you should first make sure that your investing a reputable operator that ideally has a longer operating history. In addition you should only invest funds that you can afford to loose / don't need for your daily expenses, to ensure that you can wait long enough to generate a positive ROI.
Provided that you are careful enough, investing in online casinos may be one of the very few Bitcoin investment possibilities that are worth considering.
ya.ya.yo!