There is absolute guarantee that the best sites which have been described so far are safe for your money. If they tend to slack behind on any of the features previously discussed, there might be reason to wonder. In any case, their fairness and safety levels are fundamentally regulated by the relevant licensing jurisdictions, such as the UK Gambling Commission or the Gibraltar Gaming Authority.
In any case, the most reliable and proven authorities add to the security of the site with the license they’ve provided to it. Moreover, most sites strive to assure their players, which is why many hire third-party services which test the software, RNG and any other aspect which might be deemed corruptive.