If everyone watching reported this person, I find it hard to believe the staff won't check out the situation.. Unless there were no staff online. I personally report every instance of cheating in spar I personally witness, and I strongly encourage others to do the same. It is our best course of action against this aside from complaining about it without decisive action.
If the lack of online staff is an issue, perhaps the administration team should look into accepting another application. But it isn't my job, and I won't say I know what's going on behind the scenes.