Also, in any way, does it bother you if you can't be able to figure it out that the casino is regulated or not?
For regular players like us, it is very difficult to ask the casino to prove whether they have an operating license or not. There are dozens of players, they can't vouch for each one. And do you know whether the documents they show you are legitimate or not? We can only check ourselves through the official websites of licensing regulators. Each country has a specific authority that regulates the licensing of online casinos. For example, in the UK it is the Gaming Classification Authority that manages the licensing and regulation of online casinos. Besides, reading reviews and feedback from previous players can help you get an overview of that casino.
Do you think that if all online casinos can tender some proof of being licensed all it reduce scams in online gambling?
Having an operating license can partially reduce scams. However, casinos have many ways to circumvent the law as well as sophisticated tricks to openly cheat that you cannot predict. Therefore, whether or not there is an operating license is only a small factor in assessing the reputation of a casino. The most objective assessment should mostly come from real players.