If filming is done in public for the intent to be published, should there be a release form signed by any people that were filmed? Anecdotally, many years ago

If filming is done in public for the intent to be published, should there be a release form signed by any people that were filmed? Anecdotally, many years ago I was at an outdoor park and they were filming a fitness reality show. The fitness coach was making the participant do random workouts throughout the park. In one of those random workouts, I was in the background of the filming. Immediately as I was out of frame, a production assistant provided a release form to authorize the use of my likeness in a broadcast.