The way it goes: 1.Company with great leadership gets investment (angel, VC, government, etc.) to do something great. 2. Great leadership takes the time and effort to a - understand what is needed and how to recognize talent in those areas and b - gets that talent onboard, even if it's expensive and time consuming to align their desires with the companies 3. A great team, with great leadership, does great things. 4. Great things are profitable, so the company is sold to a big soulless company, or becomes a big soulless company over time 5. Many of the people with true passion and skill leave because they can. They generally leave because the toxic environment in big soulless companies hurts them and takes away what makes them individually so great. 6. Company is left with a shell. They manufacture and sell a product, but all the people who made that product from first principles, the people who can do it again, have been alienated,insulted, or otherwise fell victim to the toxic culture and had to leave to preserve their humanity.
Source: I've been through this cycle 3 times, one with a company that went IPO and is big now, one time with St. Jude/Medtronic and one time with J&J.
Edited to correct a spelling error