Cole Cubelic asked him about his NIL donation(s) after the game against Oregon the other night... paraphrasing here, but Cuban said he asked Scott Dolson (IU AD) what the biggest donation Indiana had ever received and before Dolson answered Cuban said, "because I'll double it." He went on to say that the enjoyment he's getting out of watching IU win at this level equals his enjoyment of watching the Mavs win the NBA title in 2011.
Basically, these billionaires like him and the Texas Tech dude (Cody Campbell) are playing the role of team owner with no salary restrictions and trying to buy championships for their own enjoyment. When you really just think about it for a minute, it's kinda unbelievable.