Yeah I don't really think a meaningfully larger amount people are traveling because Airbnb is an app that exist, so demand from tourism should stay flat, no?
I mostly agree that there is probably some self-interest at play when they ask for regulation. Though the fact that one of the existing firms in the industry wants regulation doesn't invalidate all the legitimate reason for regulation. For example, existing car manufacturers might benefit significantly from all the safety requirements for cars as they create a barrier to entry for new players, but I doubt that many people want to abolish all the testing and certification cars have to go through.