That I don't know for sure, but they have a short term rental registry and the units are labeled as such and there are signs in some places and a general information campaign warning tourists against "illegal listings." Every place we stayed (4 total) was on the official registry. My understanding is that airbnb tends to play ball with these laws so as to not get banned, and most of the illegal listings are through scummy travel agents and smaller apps, which has kind of always been an issue.