"Revolutionary Discoveries" in science and medicine do not follow established paths nor established knowledge. Personal ownership is actually a plus. Personal ownership is a strong endorsement and a strong motivator. Personal ownership is one of the qualities that allows the pioneer, the inventor, the "over-achiever" to achieve the "IMPOSSIBLE" or die trying.
It is no coincidence that Anne Wojcicki was born in Palo Alto and grew up on the Stanford University campus. 23andMe is Anne Wojcicki's brainchild, Anne's project, i.e., Anne's personal mission statement.
In actuality, taking 23andMe "private" is a survival mechanism that allows Anne Wojcicki to seek more funding for her objective of using DNA to develop drugs.
NOTE: There is very little correlation between wealth, I.Q., high academic credentials, and creativity. Creativity comes from a different part of the brain. Creativity is steeped in vision, motivation, and commitment. Anne Wojcicki appears to be focused on and totally committed to her vision for 23andMe.