Update: they responded to my disclosure with a canned response "there was not enough information to answer your question, please go through our contact form again". I guess that's an invitation to publish.

So here is the primer: the Belgian National Lottery used to be e-lotto.be. They decided to change (in French) to loterie-nationale.be. You might notice that in Belgium lotto has 2 T, same for "lottery" in English while the organization is "Loterie Nationale" with 1 T. They didn't register lotterie-nationale.be. I suggested it to them, got ignored. So I did it. If you go there now, you'll get a banner informing you about your mistake. I have a couple of victims every day, a lot more on Friday 13 etc.

There was a recent scandal that our former Finance Minister is accused of money laundering 800,000€ through that platform, so it's not a small website.

It's not a bank or payment provider per se but still processing a large amount of money. I sent them a new notification. I hope that they won't take too much time to respond.