What's the Tor Dependency mean? Is being dependent on Tor good or bad? If joinstr is not dependent on Tor, are you using something else to hide IPs?  

 Riseup VPN and Tor is supported in protocol. So same IP address for all peers in a pool created with VPN.  

 So, the VPN operator knows everything each user is going?  

 No. Only connection with nostr relays.