Disclaimer: I'm new to zrok and below is my point of view which will probably need corrections.
The Free Hosted plan of zrok has a 10gb per day limit and I was wondering how is it possible to reach that limit since two peers communicating via zrok share
and zrok access
use the central zrok server just to establish a peer to peer connection, not transfer data.
What is the central zrok server using bandwidth for? From what I've written above the server mostly uses bandwidth to establish peer to peer connections and that should be light on the resources (it doesn't use bandwidth to transfer what the peers are communicating).