Network connectivity issues are the least of the problems of using a VPN for accessing a casino platform. The biggest issue in using a VPN for accessing a casino when your country is restricted is that if the casino asks for KYC verification in the future or when you make a deposit or request a withdrawal, you won't be able to comply with that because all this time, you have been hiding your IP address but now you can't hide your identity since you are asked to submit your personal documents to comply with KYC and AML regulations.
If a casino does not allow you from a restricted country or area, to register an account and use their platform, it's best to move on and find other platforms.
Trying to use VPN and pass through their filter is only making things worse for you. In the end, you will have to deposit money to bet, and have need to withdraw money. If thing goes wrong for you, like they ask KYC, how will you comply and finish it.
A platform surely knows if their users use VPN and as a user who tries to break ToS, you will have to go from VPN to bought documents for KYC. Start with bad idea, and go with another bad practical step that won't help your account and money safely.
A platform can block immediately or not but you can not blame them on this. If you intentionally break ToS, you will be done in future.
Which casinos have IP blocks in place for restricted countries?