Licenses and bonuses are important factors that can influence your decision to go with one or more online casinos. They have a great deal to do with the legitimacy of honest online casinos after all, and that should definitely rank high in your list of concerns.
Sadly, there are still many online casinos that remain in business even without licenses. Often the software that online casinos use will clue you in as to whether the establishment in question is licensed or not. Gaming licenses are required for many of the more famous casino software brands, so if an new free play online casino uses them, they are most likely licensed. It would also be a good idea to go over the terms and conditions regarding promotions and bonuses before you even begin playing.