On a norms, a provably fair casino cannot be manipulated. but with the way things are going now I can't trust a casino with my full chest just as most casinos claims that they are non KYC casino but at some point they start requesting for KYC details.
So everything has been turned upside down, so for that reason I would Say that a provably fair casino can still be manipulated just as those casinos who claims they are non KYC changed overnight. But I believe that we still have provably fair casino but you rarely get the one that cannot be manipulated.
Some casinos still maintain their stands despite what is going on in some casinos though we have seen the cases where some casinos change their rules just to favour their business and frustrate the efforts of their customers but the genuine ones will not be that bad to go against their rules if they say they are non kyc casinos. A casino that chooses to be fair will remain fair unless they are being manipulated but when they do not change overnight you will see the level of customers they would be attracting because they choose to remain who they are and not change when they have good numbers of customers.
Some casinos figured out a while ago that they can scam without being scammers. Which is just making sure that the games are not rigged, but favouring the casino a lot more, and that means if people are willing to play the games themselves, then it is consent: the player consents to playing a game that favours the casino, and that means the casino doesn't have to do any scamming at all; they would make money no matter what. How many people do you think really check the house edge of a slot game?
I can tell you that not many; if you make it 10% or more, people will not even know, so just offer them some great bonuses to start, and they will all eat it up and go play your slots instead of a 1% house edge game somewhere else.