I'd had two google accounts, one created a decade ago on YouTube and later connected to my gmail-google account. I used the same login for both, and could switch between them without problem. I had used my Youtube-persona for most of my google docs work. That was all fine until suddenly I could only access docs from my other gmail-persona. They had without warning or reason changed either the account type or the app permissions for my account type. Not a word of warning, or even a message. There's no reverting it, no one at Google has been able to undo the change or recover my documents.
NEVER AGAIN will I trust any important information to any cloud company.
That was the day I started to take everything off the cloud and access it through a NAS at home (with off-site backup of course). I've never slept better