And? Who cares?
First, the other candidates may have their corruptions too.
Second, people support Trump in spite of his know corruption because they are tired of politically correct bullshit, they are ANGRY, they don't give a fuck about past dealings of Trump.
It's not about Trump per se as an individual, it's now about a symbol, the war against the mass media and the social justice warriors, the awakening against the censure and inquisition of the mass media and their hypocrisy.
Facts of corruption of Trump DON'T MATTER, it's an emotional war of many who are tired of the system and of being told who is "acceptable" and who is not.
The others are not better, their voters don't give a fuck about trump university.