Why do link shorteners open ad-filled windows?

When using low-reputation link shorteners to download files, it's common for multiple tabs of deceptive ads and fake Windows tech support scams to open uncontrollably.

Stopping malicious shortener connections

These pages monetise through aggressive ad networks that host exploits. AdBlock Network neutralises these connections. The software performs read-only asynchronous requests to multiple independent endpoints to keep your local firewall updated, blocking connections to spam servers at the Address layer.