Hi folks, Darren here.
I would just like to clarify here that my point about relayer networks for interoperability was not necessarily providing incentives for them. Rather, I think what Polygon is doing with their AggLayer (providing a native interoperability solution) is something Arbitrum might want to pursue. By having a native interoperability solution, the relayer network maintaining it gains rights to the relayer extractable value (value generated from cross-chain transaction creation), and this revenue could be redistributed to the DAO to be used for incentives or some other policy. This is just an interesting avenue for the DAO to pursue.