It may have happened or may not have ever happened, we can't know.
Don't believe everything you hear.
There are sick mindsets that believe it's smart to manipulate systems and generate profits through fraud and deception. Just as we blame a casino if it considers manipulating the terms of service to allow itself to violate user rights, the user, on the other hand, must adhere to the limits of fair use of the system, even if they discover a loophole that allows them to manipulate.
OP's personality is either a megalomaniac who wants to feel valued when the community engages with his interesting narrative, or he's trying to trap victims by selling them alleged manipulation methods as if he were offering investment advice. Unfortunately for him, users here aren't as naive as he imagined.
When I saw this thread titled including (exploit) it was a turn off for me because for me the only way to go about this life is to go straight face whatever you want straightforwarded and not give into any pressure that can pressure you into looking for ways to exploit anyone or a platform, most gamblers who thinks their succeeded in exploiting a casino may later discover and sue you for it, since he may have probably done verified on such a casino.
Well, I will just advice you to not easily believe anything you see around here, this is an online open and general forum, anybody can come around to post anything they like, claim to be anything or to have achieved something whereas they are simply lying.
You have every reason to doubt anything and anyone if a claim is not backed up by any proof or evidence, most especially when the claim is coming from a newbie.
Understand that the op maybe lying, and this is not without motive, you see he mentioned AMA, simply means he wants us to start asking him how he was able to exploit a casino and made $1m+ in the process, and he imagined that maybe in the course of this questions and answers, someone or some group of persons will want him to guide them personally, and then he (op) will ask them to pay some fee if he must guide them, this is another scam strategy which op expects some stupid and desperate people to fall into, but I doubt he succeeded any way.
So don't believe every claim like this you come across around this forum..