yep exit nodes too. an exit node might want to charge a higher rate for this service due to more risk sharing his public IP addresses. Some mitigation could be running OpenDNS on the exit node. The Tor project has few blog posts on best practices running an exit node.

A cool novel idea is to only run the exit node when you are on public shared wifi like a coffee shop (is wardriving still a thing lol). Not sure how this would exactly work but maybe a dedicated app could be built using privacy tools like mac address spoofer, etc..