http://redlib.nowhevi57f4lxxd6db43miewcsgtovakbh6v5f52ci7csc2yjzy5rnid.onion/r/DreadAlert/comments/c7cym9/june_30th_dread_service_restored
It wasn't really built for large traffic hidden services either. DoS-ing just one node/hidden service inflicts collateral damage, mirror rotation does the same. Just like DoS-ing some clearnet site can cripple the Internet as a whole (it did happen before, and it will happen again).