AdSense does not have an alternative...google it "alternatives for adsense"...most of the these average ad networks need at least 10,000 impressions daily...adsense does not have a limitation...just follow the rules (every ad network have that)...you are prepared to getting banned, but not ready to how to prevent this ban...awesome...if you have not worked hard for your adsense account this might explain it...AdSense is catching up with buying accounts (need to place code and confirm the site)
How can you be that sure about this as google might dont like people giving away ad revenue and there is also factors what average faucet owners has not much tools to fight against like bot attacks giving bad traffic.
Edit: Regarding to FreeBitco.ins answer on their thread there is no problem on giving away ad revenue, but there is still problem of handling unwanted traffic from outcoming sources.