I think you should do a thorough research about a casino before you throwing your money into them, not even single dime. There are also a lot of other functional and trustworthy online casinos which is also tested with lots of positive remarks that you can try with also lots of bonuses and incitives.
One thing you should know is that, everyone is not the same and no one should be trusted on this internet space a d you should try searching for reputable casinos in the forum.
Not to mention, there are tons of sportsbook websites out there that are far more reputable and trustworthy. Though I am not completely dismissing OP's question of that website, but there are tons available that are well-received by this community.
Like what you mentioned, you are correct for doing the research in this forum first before putting any money. Again, prevention is better than cure and it is very wise for you to ask for feedback in the community before delving completely on it.