I do not encourage anyone to take advantage of his position to cheat in any matter, but I put forward a hypothesis that is more logical if he really intended to cheat. With this foolish behavior, he raises many hypotheses, the most important of which is that he may have been ignorant of the risks of what he was doing, otherwise he would have thought more before taking this step, which I consider very stupid, even if it was intended to deceive. This bodyguard got himself involved easily when he could have cheated better without being involved.
That should be it because of the morale to the job that they're doing shouldn't be taken advantage by their personal issues. He probably don't think that it's going to be big as this with the bet that he's made. Well, he has to take that consequence and I think the risk was there on his mind but still pursued this because of the little money that he might get from it. This will serve to the other bodyguards and other positions that might be taken as advantage for gambling in the bookies.
I am sure that there are many corrupt people like him, but they are not discovered because they certainly know better ways to exploit the information they have. In the case of this bodyguard, the most he can do to defend himself is to continue his denial, under the pretext that someone used his data to register at a casino in order to implicate him.
For sure that there are but they're out of the radar because they're hiding themselves perfectly.