I believe, but could be wrong, is that the big change is the time frame for index and managed funds buy in. It used to be a year, but it's much shorter now, like 2 weeks. Which means as long as they can maintain a high market cap relative to their exchange for that time period they will be stabilized by institutional funds and basically crowd sourcing any losses to the public and massively cashing out the internal pre-ipo investors.

At least that's my understanding of the current market dynamics regarding IPOS, if I'm wrong that would be great, and if someone else would explain it even better.