Google says it will block third-party Chromium web browsers from using private Google APIs after discovering that they were integrating them. This is because many of the Google APIs included in the Chromium code are specific only to Google Chrome and are not intended to be integrated and used by users of derived Chromium products. Google says users who have accessed private Google features such as Chrome Sync while using 3rd party browsers will still be able to access this synced data locally or in their Google account, depending on sync settings.
Source: https://www.bleepingcomputer.com/news/google/google-to-kill-chrome-sync-feature-in-third-party-browsers/