The rapid expansion of consumer-facing online services has led to an explosion of user accounts, ushering in the “billion user era.” Well-organized cyberattack campaigns are using this growth to their advantage, creating armies of fake and compromised accounts to hide in the shadows and conduct fraud against web sites and mobile apps. It is challenging for trust and safety teams to stay ahead of these fraudsters since rules and models need constant updating and are always reacting after the damage has been done.