The problem with AirBnB is that it doesn't distinguish property owners who are renting out a room in their primary dwelling are doing it to earn extra cash on the side, versus landlords who use it to turn entire buildings into vacation rentals without regard to noise ordinances and the surrounding rental market. So, AirBnB defends itself by holding up the former case as an example, while ignoring the legitimate complaints caused by the latter case.
Let's be absolutely clear here: for many major cities, if apartment landlords are able to use AirBnB, they would make a lot more money than they would through regular rentals. If enough of them do this, it would increase the cost of rent for the entire region by making housing more scarce. This is unacceptable.
Cities have fought back by trying to force limitations on the circumstances under which an AirBnB would be allowed. But AirBnB fights these because it threatens their business. They put out propaganda saying that cities are limiting the freedom of struggling property owners, or accusing government of bowing to some all-powerful hotel lobby. The reality is that they care nothing about the destruction of the housing market, or to noise complaints. I know from first-hand experience: they do not take noise complaints seriously; as long as they get their cut, there's no accountability. I've had to call the police on various "guests." I've complained through their site numerous times, to no avail. I have no leverage.
Regulations are not some intrinsic evil as libertarians would put it. Until it happens to affect YOU, there's always this prevailing belief that it's nobody's business to dictate what others should or should not be able to do. But let's see how you deal with AirBnB guests who party until 3-4 am on a weekday when you have to get up in the morning to work; how you deal with landlords who ignore your threats to take them to court; how you deal with having to call the police on a weekly basis until even they stop caring because there's nothing they can do except tell drunk asshole guests to quiet down. Let's see how you deal with having your property value decrease because you're next to a 24/7 party house. Let's see how well your "live and let live" attitude serves you when you find rents increasing in your region by 10%+ every six months because every fucking apartment owner is doing AirBnB so that they can make $4000/month on each apartment instead of $2000/month.