That's how most businessman do when they've already seen the process and have understood the ins and outs of their business. Although at the beginning, they must be the one to focus on it even if it's going to consume them a lot of time and money.
being a worker in someone else's company or freelancing if the salary is sufficient then it is better to stay in that job. but sometimes the attitude of the ego to look superior can change everything from what they have built with great difficulty.
indeed from this it is an important point for us to become workers or bosses in our own company, so all of that starts with experience from the field that we want to work on and is also accompanied by large capital and full of patience.