Thats true, license is one indication that you're in the right casino however we know its not only the basis.
What exactly do you mean by the "right" casino here? The license of a casino does not protect you in any way from someone recreating Roobet, for example, and wanting to scam you. Even if they did, it would be very easy to forge the license in such a case. The existence of a license should therefore never be relied upon when you want to check whether you are on a fake site or not.
A step on choosing a casino to play in. License is important but it doesnt necessarily mean the site is already trusted, its just one indication, and as I have mentioned its not only the basis. Because it depends on their build reputation through the gamblers who play on their casino, and usually it takes time before we can judge if its reputable.