[megous]

> In order to innovate on the user’s experience of the file system, as we are with Project Infinite, we need to catch file operation events on Dropbox files before other applications try to act on those files. [therefore we need a kernel driver]

You can block the operation within fuse's userspace part while calling out to some helper gui program to ask for confirmation. Seems like an excuse rather than a reason to implement stuff in the kernel.