Short term renters, questionable people (thieves, renters who abuse the properties around them, people who use the property poorly [massive parties that bring guns + drunk loud people]), illegal activities (like off permit filming of commercial works), brings disproportionate problems to the neighbors. Airbnb is a lightning rod of people who do that. That's one of the reasons why hotels have weird rules in states and cities.
That is exactly what the people who live under HOAs want. I despise HOAs, but I'm happy that the kind of people who like HOAs have a community they can all congregate in. It keeps some of them from mingling with the rest of us.