How to block gambling sites
If you wish to refrain from gambling and/or protect minors, you can take steps to limit or block the download and/or usage of gambling related apps on your device by using one of the following listed below, which is also working for mobile devices.
• Gamban
• NetNanny
• BetBlocker
iOS inbuilt blockers
Prevent the use of apps with gambling related content by selecting Settings>General>Restrictions. Ask someone you know to set up a code unknown to you and deselect apps rated +17. The person setting up the code for you should never divulge it to you.
Android Play Store - Gambling Blocking Apps