Feedback Xcode projects always have the unityads folder？

Is it normal that the xcode project exported by unity will have an unityads folder and two files in the Classes folder?The project I exported this time did not use unityads.
The reason for this is that I'm now going to use Admob, but when The build is complete The program will always crash and alert The Google Mobile Ads SDK was initialized incorrectly, And I'm trying to figure out why.Think you!