I'm not sure why these are particular concerns with a venture fund backed by the University's investment office focused on endeavors emerging from the university community (faculty, staff, and alumni.) They are issues that, to the extent that they exist with such a venture, exist whenever students and faculty members are involved in business ventures (no matter whether they receive funding for those ventures from a university-affiliated venture fund), and are quite likely already addressed in university academic ethics and conduct rules.
And it probably won't be 19yo students, it will be graduate, PhD, and post-docs, many of whom are actively trying to find the next big thing in their field.
Doesn't seem like much news here other than good press for the UC system, and good on them for making dollars easier to get besides trying for an NSF grant.
Extending this kind of resource to entrepreneurial students is a pretty natural move.
So it's far from being a case of intellectual freedom against quick profits.
This also introduces a lot of complications. Say a professor starts a company, is it ethical for him to ask students to work for him? If a student starts a company, and an influential professor wants a board seat, can the 19yo student comfortably say no?