I am new to Ubuntu. I was trying to connect my Google Drive account with Ubuntu and saw this related answer. When I try to synchronize gnome with the google account it asks for access to basically everything on my google account.
I saw this related post on Reddit, but I am still concerned.
My questions are: is it secure to give gnome access (read, edit, create, delete) to all my files, emails, calendar, photos, etc? Should I trust gnome?
I would say so with the proviso that you should invoke 2 step verification on on your Google account.
I have been using my Google account with Ubuntu for some time and have not had any issues of concern.
If security still concerns you, you can also install ClamTK from the Ubuntu Software Center for an additional layer of security/peace of mind.
I have been using that feature for a couple of Months now and it needs the read, edit, create and delete permissions because it allows you to access your Google Drive inside the File Manager. If you wouldn't give those permissions you could for example not open the files inside your Drive.