I don't know. Every big tech company I worked at has a lot of turnover. Then every Blind post says "its so over" or "everything is going to change" But that doesn't happen.
A year ago everybody in San Francisco was saying the entire world was about to be blindsided by the fundamental changes that would happen in the next 8-12 months and, well, that just hasn't happened.
It's hard to read anything into it.