With CoinNebula, Monero is mined by using your visitors CPU resources which would be otherwise wasted.
Why not Bitcoin, Ethereum or any other? Because Monero value is quite high and it can be mined with similar efficiency by CPU and GPU, while mining other cryptocurrencies with CPU makes no financial sense.
Monero is a secure, private, and untraceable cryptocurrency. It is open-source and accessible to all. With Monero, you are your own bank. Only you control and are responsible for your funds. Your accounts and transactions are kept private from prying eyes.
It depends on the traffic on your site. If you have a blog that gets 10 visits per a day, the payout will be small. But if you an owner of video site with big audience, you can earn hundreds USD per day. Longer the users stays on your page bigger the earning.
In other words, earnings directly depend on the processor's power of visitors on your site and on the length of the visitors sessions.