Well, it says everything, don't you think? If you invent something that you think is cool and will help people in your situation and it explodes/goes viral and this beautiful thing that you thought you were creating is used by others in ways that you don't support and had no way of foreseeing, that's not your fault and it says nothing about your motives, your goal when you set out etc ... You might as well blame Tim Berners-Lee for Air BnB. By inventing the World Wide Web, he set in motion the invention of Air BnB. Never mind that it wasn't his intent to do so. The Law of Unintended Consequences says that actions of people, and especially of governments, always have effects that are unanticipated. It is inviolate.
Besides, rarely is anything 100% wholly good/bad. The very same Air BnB that you blame (in an incredible oversimplification, by the way) for making housing unaffordable is also responsible, in the cases of two elderly people I know in Marfa, for making it so that they are able to stay in their homes when they certainly would have been forced to leave after the Great Recession of 2008-2009. It has been a lifesaver for them, enabling them to not only pay their property taxes each year but to stash away extra cash in the case of an emergency --- an emergency that, in one of their cases, has arrived. Air BnB has also made it so that houses in my neighborhood which were in the process of falling down or even uninhabitable have been bought, refurbished, and tended --- thus raising the value of all the houses in the neighborhood, including mine.
Finally, I never said anything about him being commendable. I said that, given the track record of causes he financially supports, he would be a good candidate to consider when exploring options to mitigate the impact of Tim Dunn, the subject of this thread. Maybe he'd do it because he feels bad the unintended impact of Air BnB. Who cares?