Precisely. In fact, there is a plethora of evidence suggesting true caller is a privacy invader.
Just as Izzy mentionedIzzy mentioned, itsit's clear that the phonebook databases are uploaded to their servers even without consent from the users whose data end up leaking in thierinto their servers.
True callerTruecaller uses "crowd sourcing"-sourcing" to get data to their servers. In this articlethis article by Shaik Sharoz, the author explains the logic behind crowd sourcing:
The thing happens in this Crowd sourcing is they collect the data from you you and shows to you in return. Suppose When a user installs the true caller caller app in his\her mobile, After installing it all the contacts which which are present in the users mobile will sync with the servers of True True caller app.
Consequently,
This brings out a privacy issue that your name is appearing in the search search results to others very openly without permission.