For one thing, ISPs aren't the only way to network. Mesh networks, for example, don't rely on ISPs. 

Also, encrypted traffic solves a lot of that. If you connect, peer-to-peer, to a "discovery gateway" of sorts (maybe this is how mints are going to be structured, I'm not sure) and that gateway helps you connect p2p to other users, then all your ISP is seeing is encrypted packets between IP addresses. Even IP blacklists at the ISP level wouldn't be a silver bullet for them as gateways could move as necessary. 
But if things are THAT bad, then yea mesh networks are the answer. 
Example: nycmesh.net - they happen to also connect outside via ISP, but local-to-the-mesh traffic does not.  

 thanks! 🫂