Reachable IP addresses don't help the network (like Tor), running a "node" does.
Truth be told, running a node just for the sake of the network provides minimum help. Bitcoin isn't a newborn peer-to-peer network anymore. There are dozens of thousands of full nodes that archive the chain, and do help bandwidth-wise. In both clearnet and anonymous network(s), there are just enough to keep things decentralized in case of some shortage.
It is trivial for someone to access an arbitrary number of IP addresses.
It's also trivial to just buy lots.