When Mr. Trump announced the founding of Trump University in 2005, he described it as a way to share his real estate secrets with ordinary investors. “If I had a choice of making lots of money or imparting lots of knowledge,” he said, “I think I’d be as happy to impart knowledge as to make money.” In the end, after the university was shut down amid investigations and allegations of fraud, it was Mr. Trump who again walked away with millions in fees.