Does it not work for btsync? Just curious why you would mention Dropbox and drive when they have the same privacy concerns. Or are you wanting to move away from ever note for another reason?
I work for Google, so not really concerned about the privacy of Drive.
The main reason why I don't want to use Evernote is because I want to store my notes in plain text files, so I can keep using them even in say 50 years.
If I worked for Google I'd probably be _more_ concerned since it's now colleagues who can read my stuff, not just anonymous-sysadmin-I-will-never-meet =P
Edit: tagspaces page says it works with bts.