This is exactly why I wouldn’t want to be a promoter.
You invest your time in building these guys up, and when they finally reach their apex from a popularity standpoint, they want to leave and do their own thing or explore different options. You pretty much miss out their highest earning years. This is why there’s always some bitterness between a fighter and their ex-promoter.
Of course there are exceptions. AJ seems to have a good thing with Hearn.
On the flip side, if I’m a manager, of course I would want my fighters to move like Canelo or Haney, who fulfill their contracts and move on.