holyfire
As a Holy Fire is designed to destroy everything from black side this is going to help fight agains bad internet agents.
Covenant
Not all ad and similar agents are bad, however advertisement business extedned its activity beyond simle advertisement. Now it profiles users, manipulates with private data and intrudes privacy. Thus in most cases should be blocked or limited.
The list
The simple list will include domains where advertisements, malware, phishing and other 'black' stuff resides.
Contrib
If you know 'bad' domains let me know or create PR :)