Expensive to produce, didn't end on a cliffhanger, season 2 was worse then season 1. No awards or buzz.
Netflix's reason for existing is to keep people subscribed to the service and their model shows that a new show is a better investment then a current expensive one with dropping viewers and no buzz.
I think their cost plus percentage they pay for the first 2 seasons goes up for more seasons after that so most shows don't make it past 2 unless they are very popular to critics and viewers.
Look at what happened with their purchase of Lucifer where the first season they made was a big international hit so they decided to make one more and call it a day (since they also stream the fist 3 seasons from FOX). The show did so well they wanted more episodes (from 10 to 16) and then said hell make one more season. This rarely happens.