But sounds like the entire telegram network could be taken down if the locations of the servers were comprimised. Then the message app wouldn't function anymore, so it wouldn't provide any security.
I guess the issue when your potential adversaries are nation states is that if they know where the servers are and that area is within their jurisdiction they can have your servers shutdown/seized. This obviously kills at least parts of the network, however I don't think it's implied that the network can be compromised as a consequence of this, that would truly be security by obscurity.
Outside of a mesh network or some peer to peer solution this doesn't seem like a problem that's solvable.
Outside of a mesh network or some peer to peer solution this doesn't seem like a problem that's solvable.