This is only a test. We really want to get rid of all the ads. But we also need enough money to keep the site running.
Let us know what you think in the comments. Do you want ads or do you want to give away a few of your CPU cycles every time you visit the site?
Of course the mining can be blocked by a normal ad-blocker.
Also, yeah, it's Monero and not Bitcoin (I guess “Bitcoin” has become a generic name for crypto-currencies?). It appears there are no GPU mining implementation significantly better than CPU mining for the used Proof of Work, so this kind of makes sense.