It seems they have multiple servers and some caching enabled. You will get 0 GRC response a lot of time. but at this point there are some GRC in it. http://gridcoin.ch/faucet.php

also @grider123 runs the faucet and there are ways by which you can also help. Example https://steemit.com/gridcoin/@grider123/3-gridcoin-ch-faucet-donation-post is donation post. if you can't send GRC you can atleast upvote. all payments he recieve from steemit post is convered to GRC and made available via faucet.

coinhive captcha was the first thing that was placed on the faucet and was removed coz it didn't made sense and money enough to fuel the faucet.