WordPress Multisite Disk Quota Handling


I have a question about WordPress multisite disk quota handling.

Let's say I have 100 GB available on a server, and I allow each multisite instance a disk quota/max of 1 GB.

Does WordPress automatically allocate (set aside) the 1 GB for each created site, meaning that I could only have 100 sites on my network? Or does it simply set up a 1 GB max, but allow as many sites as possible?

Since I will be offering trial periods, I want to take advantage of the fact that many users will not max out their quota...as opposed to being very limited in the number of sites a server can handle due to this allotment.