Rizzo's performance under the contract is not involuntary in the sense that he wants the franchise relationship to continue, and the lack of close monitoring of either party's performance means that he is not “right under Liz's thumb." He is practically all the way across the country in Philadelphia.
Compare the example involving Chicago Opera and Pavarotti. Liz wants to continue the franchise relationship with Rizzo, but Pavarotti does not want to perform. In addition, if he does perform, members of the opera can easily observe and monitor his performance; Pavarotti and the Opera are not in different cities as Liz and Rizzo are.