Open Source Software in the gambling industry is at best currently behind the scenes in terms of operating a website. Our suggestion is that responsible gaming operators promote the use of open-source content filtering and adblocking. Furthermore, the adoption of this software by general users to protect minors and vulnerable individuals from gambling sites should be in force now.
Here are some resources that deal with consumer protection through content filtering:
Browsing with Brave gives users a Fast and Private gateway to the web with the ability to block advertisements.
Comodo cDome is an Open Source Content Filtering project that can be implemented to filter gambling products, services, and advertisements.