These sites allow spammers and phishes to hide their true id (the sms messages are not legit marketing messages from casinos as the sms has links take you to some dodgy fake casino websites, which is their aim).

GamBlock. GamBlock is a comprehensive blocking option with very tight protection that cannot be bypassed by VPNs or proxies. Once installed, it cannot be removed for the chosen period. There are a number of subscription options and it is available on most devices, though it is best suited for Windows and Android.