Profitable routing nodes are arbitraging the price of liquidity. But low sell high. There will always be opportunities to make a sat. But the largest nodes are service providers who route only as a byproduct of having public channels.

nullcount

true.  but using a node makes sense and occasionally routing as a benefit also makes sense so in that case all nodes with public channels are routing nodes.  locking up utxo just to route isn't much sense now

2big2fail

routing nodes dont make economic sense i think. services can link directly with each other and serve their own liquidity needs and be a network router as well

faithandcredit

bitcoin

heads up... @zerofeerouting closing all channels soon

031b9bc746

Zero Fee isn't sustainable. Even with his model of selling the liquidity upfront, it doesn't incentive the long term maintenance of the channel.