It doesn't run automatically. I thought it was an interesting experiment as a 'tip jar' type thing. No I really don't expect to make even $0.01 but it's more so to gauge if anyone would actually click the button.
It may load the mining thing, but you have to hit the button, and even then it runs for something like 5-10 seconds.
I hate ads, but I thought stuff like this was an interesting alternative.