Let's face it.
Casinos are in the business to make money.
They also must satisfy their client's need to win money too, or those customers won't come back again. Just like land-based casinos, the answer is it depends upon the casino. Most of the major internet casinos have been around for a little while are safe and provide odds equal to or better than Vegas. There is the possibility in the near future of these casinos becoming certified for verification that their odds are as they have stated. For safety reasons, you should avoid small operations because they are less likely to adhere to the industry standards established by the online gaming community.