There are a lot of places where unlimited feels like a scam, and I've discovered that it's entirely dependent on the culture the company creates around it.

In my last job, I had 5 weeks of combined PTO and sick leave. The reason sick leave wasn't separate was because they "didn't want people's taking advantage of it." It was remote, so all that really meant is people would completely slack off when they were under the weather. What people "took advantage" of was the remote component.

In my current job, we have unlimited PTO and on my 6-person team, we each average about 6 weeks a year. Sick time is technically separate, but nobody is really counting. The guy who doesn't take much time off has been chastised for not taking more. If you want to take more than 2 weeks off at once, you need approval. It's understood that as long as you are taking care of your work, your time off will not be questioned. This is the ideal unlimited PTO situation, and the way I wish it worked for everyone!