Oh, looks like zebra is created by same people as bonusbitcoin.co
Also looks like they had premium adsense account too so that can't be the reason why freebitco.in is still working...
"Why am I selling?
The biggest proportion (around 80%) of income is from Google AdSense. As of Jan 2016 my AdSense account was disabled due to policy violations linked to one of my other sites (bonusbitcoin.co). This was a 2 year old premium AdSense account and I had previously never had any issues running AdSense on bitcoinzebra.com.
Because of this I am unable to maintain the high claim amounts that are required to maintain a succesful, profitable faucet. A new owner would not have these issues and could maximize the advertising income with AdSense or any other ad networks."