What's the most popular cloud storage tool for non developers?
I'm wondering if its still Google Drive. My audience is mainly smaller enterprises and non-tech people who would be interested in no-code solutions that I can build which uses these drive tools
It depends. From the few that I'm aware of, Dropbox, Google Drive and OneDrive seem to be the main ones.
If they use Office 365/MS Teams they most likely have OneDrive.