I don't know how many times I need to repeat this, but if your company doesn't communicate expectation it's a problem with the company, not with unlimited PTO policies in general.
I also disagree that my comments haven't been helpful. There's a difference between the concept of "unlimited PTO" and any particular implementation of it, and it's important to know where a problem is coming from. Perhaps there should be regulations around it, but getting rid of it entirely, as suggested elsewhere in this thread, isn't the answer.
We wouldn't ban all cars because one brand is unsafe, so let's not get rid of all unlimited PTO policies just because some companies do it wrong.
Great observation! Statistically, there are more anecdotes in this thread with employees with negative experiences with good ones. I think that's a great starting point.
If I take one day off 30 times a year nobody raises an eyebrow, but if I take 30 days off in one go it might.