But that's the point. People in the comments here seem to think that the unlimited vacation policies are about guilting people into not using any vacation. While that may be a secondary effect, the primary reason is actually to remove unpaid vacation days as a liability from the books, since that's quite expensive especially with the increase in software engineering company salaries in the past decade.

Anecdotally I worked at VMware and Dropbox when they rolled out these policies. I took about the same vacation time as I had used previously and the difference was mainly that I wasn't owed any vacation money when I resigned.