There are various licenses for online casinos. The best known are the licenses from the Malta Gaming Authority, the UK Gambling Commission and that of Curaçao. You can also look up the license of the online casino yourself. You will usually find a mention of the license on the website. Each license has different conditions, but if the online casino has a license, then you know that it is supervised and that everything is checked.
If the casino is not licensed, it does not immediately mean that the casino is not reliable. We have played a number of online casinos without a license ourselves and that went smoothly and smoothly. Since April 1, 2021, online casinos can also apply for a Dutch license. This license is intended to protect the Dutch player when playing in an online casino. Online casinos that apply for and receive a license may start on the Dutch market on October 1, 2021.
You see the latter more and more often that governments of countries are going to regulate online gambling. For example, you will find more and more permits with all kinds of restrictions for players from outside that country. Look at Sweden and, for example, Italy.