Just as a quick aside, the testnet, test condenser, and instructions on how to connect were announced publicly a month ago on the @steemitdev account, so I do want to point out that it was linked to in public channels on Steem.chat, available and referenced in following Steemit official posts, and had a channel in the steemitdevs discord monitored by developer advocates.
I'm not suggesting that there was enough of a big deal made out of it; every single post from Steemit should have been ended by saying "remember, get on the testnet and try to break things!" and that's part of our communications call... but at the same time, the testnet was in no way hidden away from any witness asking for it in the way that is being insinuated here.