this is an issue that I've seen in several beach towns in france as well, and it's not limited to airbnb. You will see real estate places that offer weekly rentals of beachside properties at very high rates. Of course those places are basically unused outside of that.

This sort of stuff sets in, and then of course people are shocked that their entire local economy lives or dies off of one season. We should build more housing of course, but limiting the percentage of places that can just be sitting empty most of the years seems super important. At least making it extremely expensive to keep them empty