In a narrow sense, yes, but virtually all investor returns typically come from a few big winners. For example, although many Y Combinator startups have achieved great success, most of YC's returns come from just three companies: Airbnb, Stripe, and Dropbox. If all an investor's winning startups exited at the ~$10m level, their returns would be anemic at best, and would quite possibly be negative after factoring in losses from failed companies. I think that's what the grandparent comment was getting at.
They're both multibillion dollar backed companies, so more likely the opposite will be true: any regulation against them will be lobbied out of existence.
Not exactly. There will be couple of other companies in their portfolio which would shut down and the VCs would lose all their money. So they really need a big exit which would make up for all the other losses.
Don't they make returns anytime their money invested is less than the money gained from the sale?