Emacs + org mode on desktop (in a Dropbox folder). Orgzly for mobile.
Most of what I do is in one huge text file, making very heavy use of org-mode's outlining features. It satisfies your requirements, I think. The worst part about it is that it doesn't merge conflicts gracefully (if I somehow gasp forgot to save on the desktop or forgot to sync on the mobile).
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
Emacs + org mode on desktop (in a Dropbox folder). Orgzly for mobile.
Most of what I do is in one huge text file, making very heavy use of org-mode's outlining features. It satisfies your requirements, I think. The worst part about it is that it doesn't merge conflicts gracefully (if I somehow gasp forgot to save on the desktop or forgot to sync on the mobile).