Earlier quoted context omitted.
Leaked into what? If you are using Google Spreadsheets your "secrets" are already on Google servers and are "leaked" long time ago.
While technically true, this is the first time I'm actually thinking "maybe I'll start using Sheets". I hate Google and giving my data away, but lately I often feel that I'm missing pleasure of easy use by avoiding all these hateful botnets. So, eh, maybe I just die before it gets actually massively harmful, and then fuck it. We need open source implementations for stuff like that.
We have open source implementations for nearly everything that is provided commercially. The problem is that no company wants to use said implementations.