I don't support game-protect.com, but what I agree with them is that Curacao "license" is just a piece of toilet paper. It doesn't guarantee anything to the players as Curacao jurisdiction does not participate as a mediator in disputes between gamblers and operators. This piece of paper is not accepted by developed countries. Some casinos use it because they want to pretend that they are legit and the cheapest way to do that is to buy the Curacao "license".
Yep, I agree. Having a license is meaningless, and
not having a license is also meaningless. The only two metrics I'd look into whilst deciding where to gamble would be the duration for which the site has been around, and the volume of successful withdrawals its processed. The user "crashingcrypto" ran a series of fraudulent websites all while claiming to have a Curacao license, and he ended up exit scamming. In the same vein, multiple sites that don't have a gaming license are processing withdrawals to this day.
It's good that you exposed this dude, but for your own mental well-being, don't put too much effort into this. Ultimately, the players don't really care. Just work on being a good site and your site will flourish.