Re Google Drive.
Ive used it for the past 3 years for drafting large documents with 3 collaborators.
You can have real-time collaboration on their office applications. this is one of the big draws.
But also file access control and sharing are all excellently implemented.
It also saves a lot of versions and history of file management not sure how far back but it has saved my life a few times
I could see it being used for construct game dev especially where you could save a project folder have restricted access to the main capx file and say give artists access to image folders etc. yep would be good.