CJDNS has a autopeering feature. Anybody can join the network, and it still will be encrypted. However the biggest flaw here is that you will be random connected to some peer. Some peers will most likely push high bandwidth that cause to bog your speeds. Plus that random peer will know your data chucks, and where it is being transfered to. The node operator will have to switch back to static peering due to pressures of sibyl attacks. Users will not like the idea of connecting to random peers, and not have complete control of data transfers. But nodes could still advertise the bandwidth speed ratio based on micro payment. One could scan the qr code, accept the ToS, make payment, then connect to the node.
Well, you can’t access the current server-based Internet through SAFE.
Are you thinking about restricting it to only SAFE network access?
Other known as exit nodes. Those are bad security holes, and should not exist.