Too bad -- I guess dropbox isn't doing anything to get efficient what's-changed notifications from the OS, then (since the only platform-specific code is the UI). Because those hooks are not at all cross-platform.
Totally unrelated request - you posted your YC application a few years ago, but the link 404s. If this is intentional, you can forget it, but if not, I'd really would like to see it,
/probably obvious to all you actual dropbox users