Once this technique is known, I would imagine that authorities can exploit this by uploading bogus maps or many many bogus maps so you don't know which is the legitimate map and couldn't find it quickly enough even if you did.
that's no more true with the web than it is with mesh systems. The HK protesters are using a source of authority for this. This can be extended in a mesh system with a web of trust, not that that's w/o it's issues.
