Disclosure: Covert Web-to-App Tracking via Localhost on Android

https://localmess.github.io/

"We disclose a novel tracking method by Meta and Yandex potentially affecting billions of Android users. We found that native Android apps—including Facebook, Instagram, and several Yandex apps [...]—silently listen on fixed local ports for tracking purposes."

After reading all this, I've just been starring at my screen for like 10 minutes.

Can't express my feelings in words... Disgust? Anger? Don't know.