Bill Gates' wealth grew much more after he left Microsoft than while he was CEO. Was that wealth earned through innovation? No. He simply owned something that became more valuable as other people labored to innovate.
If the value of MSFT tanked after he was no longer managing it, people would have said he didn't do a good job setting up effective systems.
So what? He owned the stock, he gets to share in the gains.
If we believed that the only people who should be morally allowed to benefit from asset appreciation are the people who actively work for that company, the entire economy would collapse.
For example, every pension fund, endowment, retirement fund, etc. are all invested in financial assets that they had NO role in. All they do is own something that become more valuable as other people labor and innovate! Shall we cast them as evil capitalists?
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Institutional innovation continues to pay off after you leave. You will make more over time if you build a company with a moat, if you set up a farm team system so your company can continue to innovate, if you eschew cash grabs in favor of solid customer service. If you take away the incentive to set up a continuous wealth generator, you will see founders spend their last year as CEO looting the company instead.