Some folks learn the cam placement pattern
And a lot of those folks have given thought to the subject are cam thieves.
Unfortunately, it's not just hiding the small trail cam. Many are placed within 200 yards of a road or trail. Thief merely has to locate the corn feeder, the corn on the ground, a trodden way, and sometimes a big ol elevated tree stand condo, guarding the corn feeder and the small little trail cam.
The sign the thief looks for is simple human nature. Folks don't like hauling those bags of corn, too far into the woods. Pictures or no pictures.
Next thing you'll know, hunters will be required to carry a climbing tree stand, 400 yards to a tree, and return to carry in a big bag of corn. Why it'll become downright backbreaking stevedore work, if the hunters have to do that.