Airbnb should run a promotion for free nights at hosts who live within a mile of a Trump property. He'd notice if someone was trying to take business off him, even nominally.
I mean, it might work if airbnb and trump properties share the same customer base... which they might. But then it's more likely to attract people looking for free accommodation rather than customers of Trump properties.
Besides any of Trump's customers who want to make a statement have likely already taken their money elsewhere.
But then again I'm not from the US and I know nothing of Trump or Airbnb, so maybe it would work.
Eh... I have no idea why I started writing this comment :-/ .
How much longer do you think AirBnB's regulation flouting would last if they went to war with the President?