Yeah, but you not getting what you want, you not having own little imperium is not the same as "you having legal obligation".
This amounts to an argument that if doing something immoral gives you money and power, you can not possibly say no and no one can blame you. That somehow more money and power is good enough excuse.
If you get the money and then try to U-turn and refuse to chase growth, the board will start asking questions
The legal obligation is that CEO does whatever board tells him to, otherwise board can fire ceo