Believe it or not, even large and mature companies often initiate entrepreneurial efforts inside their own companies, and they look for employees who have the right attributes to make this happen. If you want to explore the world of an entrepreneur, without jumping ship, this would be the way to do it. Entrepreneurs working inside big companies are called “intrapreneurs.”
Many companies do this to explore opportunities for growth outside their normal domain, and compete with conventional startups, to penetrate new markets and profit from the next big thing. A reason on the other end of the spectrum would be to de-consolidate non-core functions to live or die on their own merits. A third reason would be to mingle and learn from the startup culture.