I do not say anything about security issue regarding this, but I needed a way to sync my Companies OneDrive and my private stuff to Google Drive. I tried a lot of different cli application, but those did not work for me.
I have now found an application that works, and I only need one application for both soloutions.
The answer is Insync.
I found out that one thing that do not work is sync with Google Pictures after google split drive and picture.