While there's no centralized database on the prevalence of hidden spy cameras in beach changing rooms, reports from law enforcement agencies, media outlets, and online forums suggest that it's a widespread issue. According to a recent survey:
How the "blurring of public and private" via mobile devices and constant recording fuels a culture where daily life becomes "content". Brock University Hidden Spy Cam Voyeur - at the beach changing rooms
Given that you cannot rely on the facility to scan for cameras, you must become your own security guard. Here is a 3-minute safety protocol for any beach changing room: While there's no centralized database on the prevalence