I think if they are flat out not allowed to be out there that makes sense. In Montana, I don't think you'd have any way of knowing. Even a cell cam can just be a regular cam without a subscription.
It's kind of weird but I was really concerned about this because I use cell cams for trapping, which for a part of December overlaps with Montana's muzzleloader season - which is an elk and deer season. I put them out along with my traps on Dec 1. When I reached out to a Warden via email to ask about my concern with having cell cams out there coincident with a big game season, he said not to worry about it, but reading the regs at the time it seemed like a gray area to me.
It's kind of an aside, but in the context of trapping I think cell cams make things more ethical if anything - minimizing the time an animal is in a trap, notifying a trapper if nontarget animals are in them, etc.