Business owners don't really have a job in the first place; if the company turns a profit and their ownership isn't somehow revoked then they have no reason to quit, even if any work like management or executive decision-making is done by AGI for them.

Since the businesses are the private property of the owners they hold the right to any value that comes of the company's functionings, no matter how little work the owner contributes vs the AGI or how important they are.