A horrible and unreasonable idea of the IP blocking initiative.
If you are keeping funds that security of itself specifically needs IP address allowance, you truly should reflect on whether you should keep such an amount on a casino or not. 2FA for security measures is enough, for casino scale. IP address limitation requires users have a static IP address, which only a few people may have it. Plus, this is a casino, not an exchange or store/keeping funds-oriented platform.
If you have IP address allowance option that what problem may happen? There will have no problem except clicking on the link from your email. If anyone can hack your information but could not hack your email then you may save your fund from being hacked. I think it is nothing but an extra security measure.