There's actually a lot more to this! The directionality of their traffic is a massive factor here. This isn't a result of cash app users paying fees to c=; is because users are paying OUT.

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if a cashapp user wants to pay or receive on lightning they have to use their node presumably thats the majority of their routing revenue extrapolating this to routing nodes that do not have user lock in makes no sense
Right; this isn't reproducible by most routing nodes. You have to be driving massive volume and actually paying out via lightning. Payroll providers could reproduce this.