When the wall is made of people, its hardly a wall. Even if Google doesn't use insider knowledge to copy Uber, unless Uber had no other possible investors it w

When the wall is made of people, its hardly a wall. Even if Google doesn't use insider knowledge to copy Uber, unless Uber had no other possible investors it would later wish it had an investor who was out to kill the competition rather than an investor who is the competition. Thus the problem with VC arms of major tech companies.