Hey guys, Ofir here from 99Bitcoins.
I'll be the first to admit that we should have put that notice straight from the start. Thing is that at the time we didn't really know what we were doing and wanted to test some stuff out. In any case, the miner was running for a very short time before we understood the importance of this and put up the notice.
Our faucet is one of the oldest and highest paying faucets around, and with the increasing price of Bitcoin it's getting hard to sustain so we need to get creative with business models from time to time.
It's important to say that the miner was running only on the faucet page and on no other page on the site as well.
For now the miner is disabled, we're still testing it from time to time but it will show a very clear notice if it's running.
Glad I caught this thread, let me know if you have any specific questions.