A direct P2P connection over the internet is not private, as both ISPs can see who you're connecting to. P2P over an overlay network like Tor or I2P is better, but still not perfect: 
I think many of those same points apply to I2P?
Privacy Guides Community
SimpleX vs. Cwtch, who is right?
So clearly one of these people is lying to us, but I don’t have the technical knowledge and capabilities to tell who is right and who is wrong. ...
