What’s your risk model here? Google are not manually or automatically inspecting the contents of your spreadsheets in order to profile you and show you better-p

What’s your risk model here? Google are not manually or automatically inspecting the contents of your spreadsheets in order to profile you and show you better-personalised ads. Not enough people have such a spreadsheet for it to be worth it for them, I’m sure - and they also probably already know approximately how wealthy you are. Unless you’re under investigation for fraud or something, I doubt the government could get much use out of being able to access your financial spreadsheets via Google compared to the information they already get directly from banks etc. So that only really leaves criminals (for whom I still can’t see a great incentive to read your spreadsheets), and I also don’t really think your Google account is much less secure than your computer’s local storage (if that’s the other place you would keep it)