>incentives to compete by behaving less duplicitously also increase
There are no disincentives to do it and people may want to do it regardless of any incentives that are in place. There being transactions that are illegal to relay (money laundering), so legally nodes are unable to relay no matter the incentives.
>that may mean unorthodox means of finding those users
This has poor usability. Normal users don't want to deal with manually finding nodes themselves. It is hard to figure out the reputation of nodes when their is no hard proof of who the actual owner is.
There are no disincentives to do it and people may want to do it regardless of any incentives that are in place. There being transactions that are illegal to relay (money laundering), so legally nodes are unable to relay no matter the incentives.
>that may mean unorthodox means of finding those users
This has poor usability. Normal users don't want to deal with manually finding nodes themselves. It is hard to figure out the reputation of nodes when their is no hard proof of who the actual owner is.