It's not shut down, yet, Microsoft is just doing something with their Azure database
staff were really picky about what was posted which prevented some really cancerous blockland-esque growths from plaguing it, then garry decided to migrate to newpunch, broke everything, everyone complained and then they removed all rules. 2 months later they shut down the site (now)
Also, i don't recall them removing all of the rules, especially any time recently, and i browse Facepunch almost daily, there were definitely rules just earlier today