IOWA CITY — Less than 24 hours before former University of Iowa swimmer Thomas Rathbun was scheduled to swim the 800 free relay at the Big Ten championship meet in February 2017, the Sioux Center native was ineligible to compete. The reason? Rathbun and Chris Dawson, a friend and fellow UI swimmer, had used their names and photos on a GoFundMe campaign to launch a T-shirt company, a violation of the NCAA’s rules prohibiting college athletes from using their names, images or ties with college sports to make money.