tor is the ramshackle.
i built this https://github.com/indra-labs/indra in the last 12 months. most of the protocol tests and implementation are there.
it uses lightning payments and a slightly customised channel type (zero fee) inside the network and users pay for small sessions of bytes/seconds. the relays provide exit services that they advertise, minimally providing bitcoin and lightning services and whatever a relay operator wants to, at whatever price is practical for them.
it could scale, unlike tor, because it has monetary incentive, and by using keysend/AMP lighting payments, the senders are hidden from the receivers.
i would love to be able to work on getting it built full time but right now i'm so poor i'm doing linux administration and devops work and this afternoon i have a consultation for some trading bot dev work, which hopefully will involve some actual Go programming.