There was an article about several tech companies offering “unlimited vacation time”. Wound up that any time someone took a vacation, the others working there would look askew at that person.
By the time it was over, the (probably gay) tech company owners had the last laughs - people actually took LESS vacation, since there was no “use it or lose it”.
My company just started offering “unlimited vacation time” to senior employees. I think of it as a form of reverse psychology.