It's definitly interesting to see them move. Google already has Google Analytics/Firebase Analytics which pretty much every app developer integrates given their generous free tier so the extra data seems to be diminishing returns for Google. Seems to be more of a loss for Twitter than Google's gain given now they won't have a GA like equivalent.

I don't think Fabric was ever used for Twitter ad targeting just by reading their TOS unlike the Google/FB world and their analytics products but I could be wrong. Seems like a case where Twitter didn't realize the full potential of Crashlytics and Answers.