Mopub is an advertisement network.

It has been added in Spybot Anti-Beacon 3.4 because we encountered apps that do not inform the user about the use of Mopub. Since any contacts to third parties can be regarded as sharing PII (Personally Identifiable Information) in the European Union (IP addresses are PII), software using third party web servers can be regarded as tracking, and without proper information, consent and control, as spyware.