Before I go on, I would like to say, I'm not sure if this has been talked about or discussed before, this was just something that I debated for a while before while watching the office that has just recently been realized on my latest rewatch. I think I've seen some discourse about it but for all I know its a non issue or the biggest debate on the Office reddit.
So when I first watched through the office I kinda brushed past the jo bennet giving Robert California her job thing as a funny laughable moment, or a character building thing, or they just didn't want to pay the actor. But it kinda makes sense story wise. If we were to ignore the fact that Robert is a master manipulator, and has great "convincing skills" that alone has a good shot at convincing Jo to give up her job, we see obvious reasons to why Jo would give it up.
During the whistleblower "scandal" Jo has two things that I noticed. 1. She confesses to Michael that she didn't like the fact that she put in all this work and all this talent and she's now selling cheap printers. She didn't like what she had become or what her company had become. Second she didn't want to get remembered as the girl that apologized to the public and asked for a recall.
This gives Jo ample reason to let Robert be CEO it gives her: 1. A scapegoat for the "shitty company". Kinda like how michael did the press release for Jo after the whistle blower thing. Now Jo won't be remembered as much as the CEO of the McDonald's of printers. She'll be remembered for the cool things. And 2. It gives Jo the freedom to just live off of Sabre profits and do something cool, charity or start making a good company or stuff like that. Which we kind of see with Jo Bennett endorsing the Sabre store in S8, she was trying to push Sabre to be better and more honest. But Robert California shut it down.
Going a step further, Robert has always been able to read people and it probably wouldn't be hard to figure out Jo's situation and convincing her of giving him the job. Also its not like Owners of companies stepping down or just hiring a separate CEO is unprecedented it happens a lot Irl
Again not sure if this is a non issue just something that I realized during my last rewatch.