If anything, I think he probably helped Cleveland by opting out. I don't know their numbers and how close they were to the cap (probably not very close, considering most of the team had expiring contracts and Irving and Varejao were probably the only two larger contracts on the books). This means they can make a run after FAs, since they can't go over the cap with those contracts, but they can go over as much as they want with bird rights players. It was always known he was going to resign, so its probably best from the teams perspective that he does it after their moves are done.