AFAIK they count the entire processing fee as revenue. It sort of makes sense. If I were to make a service on top of Twilio and charge you 1% more than Twilio,

AFAIK they count the entire processing fee as revenue. It sort of makes sense. If I were to make a service on top of Twilio and charge you 1% more than Twilio, then I have to count the whole amount you're paying me as revenue and the whole amount I'm paying Twilio as a cost. That's just as logical as if I were to build a value-added service on top of AWS, or if I bought things on Alibaba and then sold them in America.