On a train to #Dagstuhl, I finally got to read the nice write-up about on-device local-web-to-app tracking: https://localmess.github.io/assets/bridges-to-self-localmess-usenix-security-26.pdfTL;DR summary: You might want to uninstall (or deactivate if pre-loaded) all #Facebook and #Yandex apps from your phone. That kind of behavior is pretty clearly malicious - not even just ethically wrong, but seems actually illegal (at least in the EU, though IANAL).