I've never used a trail camera for anything, butů
You may be overlooking one of the fundamental differences between hunting and trapping. Hunting requires your timely physical presence in order to bag your quarry. You have to be right there, in proximity to the animal, to send a projectile at it.
Trapping does not require your immediate physical presence for a capture. You set the trap, and you come back and check it. So.. instead of setting up a camera, and then coming back to see if you have taken a picture of your target animal, why not set a trap, and just catch it? If you have to come and check the camera everyday, you might as well check a trap.
And if there are no animals there... well, the trap will tell you that just about as quickly as the camera will. And again, if you're dedicated to making a trip to check the the camera, why not check a trap?