Hard to talk about crime here, if they report it few times, asked for fix, then finally use it, as team never reacted properly, so you eventually do it cause others could do it too...

That doesnt matter. That even more so proves that the team wasnt aware of the issue or understood it. People can be wrong and make mistakes. Doesnt mean you get to steal from them. "Oh well, I warned them. Now its ok I take the money."
Thats not how anything works.

Nor does it matter if it is or not fully blockchain integrated.
If someone takes your World Of Warcraft gold, thats theft, doesnt matter if its just numbers in a database.