They said that taking 2 weeks as a single slab is OK at any time, taking more than that requires a bit of coordination and paperwork. Taking smaller pieces along the year is trivial; I did it many times on a reasonably short notice.
That is, sometimes it's not a scam.
Your vacation time is whatever the company is required by law to pay out upon your separation from the org. Anything above that is “graciously” provided to you, at their discretion.
You're trying to remind me that the company is not my friend, it's a machine. I fully agree. But certain things, like not making me leave the company just to have a 3 months of vacation, are just profitable for the company. The same way paying me my salary is profitable for the company, and they won't cut it unless things would go really bad for the company.
I worked at a company with a not-unlimited vacation policy and this is roughly how shutdown periods worked anyways. You were forced to spend vacation or take the period unpaid. Unfortunately they rarely seemed to be communicated more than a couple of months in advance..