Can campgrounds list their trailers as Airbnb rentals ?

Seaville - Can campgrounds list their trailers as Airbnb rentals ? I’ve been noticing it a lot lately in a certain campground that I stay at for the season. These are not family members or owners but complete strangers because I have asked who they were and they told me. They are usually down during the week to where the regular owners are here on the weekends.