A tracker is a piece of software meant to collect data about you or your usages.
εxodus reports tell you what are the ingredients of the cake. They analyze Android applications in order to list the embedded trackers.
Search a report
https://reports.exodus-privacy.eu.org/en/
Note on process
εxodus does not decompile applications, its analysis method is legal.
However, be aware of false positives. See our post on Bitwarden.