What happened to data backup to Google Drive ? was using an API from Google drive, which is now no longer supported after this year(2019). Though there might be alternatives, I have realized that relying on third party solutions/API's might not be the best idea. What this translates to users(you) is that there would not be a backup of stats anymore after version 5.0.2. I will introduce an option to sync the stats through my own server in a future version(this will be subscription based and as always completely optional).

Why is there no direct transition ?

Because that would be breaking what is promised. So as of this version(5.0.2) users will be signed out of the server.

Will this mean there would not be usage stats sync anymore ?

No. Usage status sync is based on Google drive.