Zuckerberg has absolute control of Meta, he is the one calling all the shots. Bezos doesn't have total control on Amazon but sits on the board and has the most voting power amount shareholders, so was the case with Benioff until a few years ago when he started dropping stock to buy expensive toys like Time, but he is still the single largest owner of Salesforce. So, many of the original co-founders of these companies are still there, they just have much different goals and interests than their younger selves.