Implicit trust is how to decode 'white privledge' quickly. Point being that it is something to take for granted, unless you have to establish it (or pay for the privledge). But it is very necessary in tech where alot happens by way of informal networking & referrals and lots of heuristic social screening comes into play (buy necessity, not malice). So those who have implicit trust are at a huge advantage (or at least an even playing field). And those that don't are on the ooposite end of that (battling uphill, etc).
Another example that should be nearer to the hearts of anti-YC partisans: the "looking for people that look like Zuckerberg" bias Paul Graham accidentally evoked a few years back.