First, it is important to understand that being a founder and CEO does not necessarily mean that one has all the skills and knowledge needed to succeed in every aspect of the business. The founder and CEO may have expertise in certain areas, but may lack experience or knowledge in others. Therefore, it is entirely possible for a founder and CEO to apply for a job that is outside of their area of expertise, in order to gain new skills and knowledge that will benefit their current company.
Second, even a successful business can always benefit from new perspectives and ideas. The founder and CEO may have a certain vision for the company, but by gaining new experiences and perspectives through working at another company, they can bring new ideas and strategies back to their own company.
Third, as a founder and CEO, one may want to be a part of a team again and enjoy the dynamic of a team, and this is where a job at another company can be beneficial. Being a founder and CEO can be a lonely job and working in a team can be a great way to gain new insights and ideas.
Finally, it is also important to remember that being a founder and CEO is a high-stress job, and it is important to take care of one's mental and physical health. By applying for a job at another company, the founder and CEO can take a step back from the stress and pressure of running a company, and regain a sense of balance and perspective.