<ul><li>BOLT4 defines onion routing for messages and payments in the lightning network.</li><li>Payment routing is incentivized in the lightning network as each node hop collects a fee.</li><li>However, the incentivization for message routing in onion messaging is not clearly defined.</li><li>As usage of onion messaging grows, the current model for forwarding onion messages may face scalability and reliability challenges, similar to the TOR network.</li></ul>

how is onion messaging on the lightning network incentivized?

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