I can see the Dems recruiting him or someone else to act as a third-party spoiler, if they don’t think they can beat Trump head-to-head with any of the current occupants of their clown car.
Mark would have big-time #metoo problems
Mavericks and Mark Cuban Sanctioned by N.B.A. Over Handling of Sexual Harassment
https://www.nytimes.com/2018/09/19/sports/mark-cuban-mavericks-nba.html