Why do link shorteners open ad windows?

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

Blocking malicious shortener connections

These pages monetize through aggressive ad networks that host exploits. AdBlock Network neutralizes these connections. The software performs read-only asynchronous requests to multiple independent endpoints to keep the local firewall up to date, denying connections to spam servers at the Address layer.