I think you're a little premature with your accusation. As usual you're an asshole and very aggressive with the site.

Here's what I see.

1. you tried to help by reporting some stuff in their thread. Good action by you.

2. They didn't take into account all your suggestions.

3. You exploited the bug yourself, self admittedly.  Whether or not it was trying to reproduce or exploit it still happened.

4. You were asked for kyc after this action and unable to participate. At this point you become aggressive towards the site and decide to be an ass and open a scam accusation.

Sound about right?

From my experience with Blackjack.fun I do not think English is their 1st language. It may not be yours either but I understand you pretty good. Instead of opening an accusation because you were asked for kyc, you should have maybe tried to pm and communicate further without acting out. Maybe get them to understand what and why things happened. If that didn't work, pm their campaign manager and see of he can get the owner to understand.

It's only a scam if they don't allow you to wd. If you ask to wd and pass kyc and they don't send your funds, then it's a scam dude.