The primary issue here is that many people around the world are pissed with Russians just because of Putin, but this doesn't imply that all Russian citizens support his decision.
If that were the case, we wouldn't see some of them protesting on the roads against their own President knowing the risks involved. It's best to consider sanctions that screw Putin and cause minimal damage to the Russian public.
You can decide whether or not to boycott a particular casino. It's an individual decision. As we can see, many companies around the world are withdrawing their services and products from the Russian market and expressing public protest against the aggression. I don't think it's directed against the Russian people specifically, but rather against Putin and his policies, which are morally revolting. I've never been a particularly political person, but I have two feelings about this: first, we should learn from history and try not to repeat the same mistakes; second, we should support all these decisions that protect the lives and safety of all people on the planet.
Now, it is in your hands to decide on your strategy and to make yourself heard. Don't sit back and do nothing, but try to do something in any way you can.