There's a hosts file that's maintained with many gambling sites. Install it, and your computer can't access those sites anymore.
I think it's linked in one of LoyceV's first posts merited by Vod. If you can't find it I'll post it when I'm at my computer again.
Yeah, please help me find it
Here it is:
I have added this line to /etc/hosts
Now my computer can't access that phishing site anymore.
Someone who has time should maintain a list of these phishing sites, and we can encourage all new users to update their hosts file.
Someone already did that:
https://github.com/StevenBlack/hosts (scroll down a bit to see many different categories hosts files). The one mentioned above isn't on it though, so I've added it by myself.
StevenBlack lets you choose gambling, porn, social or a few other options. I only block all advertising. If you do that, many paid links in Google don't work anymore, so I enabled a few again to use some links.
If you don't mind me asking: why would you want to block all gambling site? It is so you're not tempted?