I don't even think about taking advantage of the bugs in a casino, because when that happens, they will also detect things that are not natural when we win a game for example. When that happens it will affect our account which may later be limited because it is detected and considered cheating. In fact, it is not cheating that we do, but rather take advantage of something that we can benefit from.
Yes you are right, they can announce such things, not for the purpose of contests or the like, but for their interests as well.
Taking advantage of the bugs can pose a harm to your account especially if you are using your main account that is verified and has funds in it. Your account can be flagged for doing unusual activities that violate their TOS and thus, could be given a punishment such as account restriction, suspension, and even being permanently banned. If you want to take advantage of the glitches, make sure you are ready for the consequences because there's no such thing as unnoticed in casino monitoring.