This is a nice analysis, although the causes of a high points per minute score could presumably be related to whether it gained an early vote / comment from a user with high karma (who is effectively giving it a stamp of approval).
This only had two points on 20 minutes when I voted for it though, so by their own logic is unlikely to make it to the FP!
There's more details on the technical setup behind WriteLaTeX (in particular the use of docker) in this slide deck by John L-M: http://jdlm.info/ds-docker-demo/#18