Why do many companies always send out recruitment information when they know there is no shortage of people?

Through this situation, we can easily see that the biggest reason for a company to post recruitment information online is to expand its influence. As we all know, the purpose of any enterprise is to make a profit. If a company wants to have more customer resources to improve its economic benefits and public influence, it must spend a lot of thought. And most people will be prepared when submitting their resumes.