I kind of figured this was part of the goal at Twitter. 75% of staff was the number that was originally floated, so maybe the thinking here is that after a brutal layoff round, another quarter will say “fuck it” and leave.
Not at places I've worked. The first to get laid off are low-performers that everyone knows is a low performer and no one likes. The unproductive lifers usually have built a system or two, and they're just coasting on that while doing as little as possible.