Back when Vegas was Vegas (and men were men, lol), you'd get you arm broken, your camera confiscated, and your butt kicked all the way out the front door. Today, well, Harrah's has made it safe for all sorts of doofuses to hang out in a casino.
I actually saw Mr. & Mrs. tourist taking snapshots inside the Paris casino on a recent visit, said something to the pit boss, who shrugged his shoulders.
Frankly, I think part of the laxness is that it's no longer "uncool" to be caught in a casino. Back in the good ol' days, the casinos were protecting their guests' privacy.