But with the use of VPN, it is for sure that many will still be able to gain access.
Using VPN means that you will only be gambling in the casino, but you will not be able to withdraw if Brazil is restricted by the casino. Meaning that they should be careful to read ToS of any casino they want to gamble on with VPN.
Yes, you're right. The users from there need to understand the risks and consequences that they're taking if they're going to do it like that.
The casinos have all the rights to do what's necessary to protect the cause of their business. And usually, they don't like users from countries that have strict rules about online gambling like what they have right now.
If they're not allowed to withdraw, they have the right to do that. But I think for most cases that are like that, they're allowing to withdraw all the funds and then close the account and they're never allowed to get back and sign up.