Unfortunately CrowdedYet has been forced to shut down. If you are looking to see how busy buildings on your campus are head to waitz.io/[school]. For example www.waitz.io/waterloo.
Below is what one of the schools used to look like.
Universities/Colleges (Historical View)
Cease and Desists
Initial Notice
Follow-up Notice
Just to make it clear, I appreciate how respectful Occuspace was in this process. To see the support received from students, check this Reddit post