Google has reached out to SwiftKey users, informing them that the app's normal ability to predict text while typing based on Gmail data will be suspended soon. This measure is to come into effect starting from July 15, 2019. Then again, this may not be necessary should the SwiftKey developers comply with Google's latest privacy policies.
https://www.notebookcheck.net/SwiftKey-may-lose-Gmail-optimizations-soon.426721.0.html