This has happened so many more times than this with prop betting. They just haven't caught people. The only way they caught this guy is because he's such a fringe player that the betting activity was easy to spot. If it were a more popular player, for example Calvin Ridley, who already has more money placed in his props, it would be much harder to catch.
Betting is out of the bag, but these prop bets need to go away. It's way too easy for an individual person to control the outcome to a prop bet on something that specific person does in a game. It's hard to fix a whole game without a conspiracy. It's easy to drop a pass to keep yourself from scoring, or from going over a specific number of catches, etc. Super easy.
I realize that some will say why do it? They have so much to lose. People have problems and also get themselves into situations where they are vulnerable to outside control. That's why they do it.