The purpose of the shared project has nothing to do with nkn, either in usage or ahem a blockchain.
The shared project is more of a p2p VPN to access remote services privately, as opposed to a VPN for accessing the broader internet. Yes, there are other services that do something similar to Zrok, but this actually builds on one (openZiti) presumably to handle the connections more abstractly (and also presumably to launch their own paid SaaS endpoint?). I could see this more competing with Tailscale to access Internal tools at a company, or for home-lab users who want to access/share services they're running remotely.
The shared project is more of a p2p VPN to access remote services privately, as opposed to a VPN for accessing the broader internet. Yes, there are other services that do something similar to Zrok, but this actually builds on one (openZiti) presumably to handle the connections more abstractly (and also presumably to launch their own paid SaaS endpoint?). I could see this more competing with Tailscale to access Internal tools at a company, or for home-lab users who want to access/share services they're running remotely.