[qnr]

I highly doubt it really mines bitcoin because with the current difficulty a typical modern graphics card can expect to mine less than $0.01 worth of bitcoin a week if left running 24/7 on full load.

Edit: what I meant is that EpicScale in all likelihood mines another cryptocurrency, not bitcoin. Especially that it seems to use CPU which is utterly useless for bitcoin mining (you won't even get $0.01 in a year with the latest i7!)

[wldlyinaccurate]

From the Epic Scale website (http://www.epicscale.com/):

How is money earned?

Solving math problems for weather prediction, physics simulations, cryptography (including cryptocurrency mining) and more has real world value. We solve these problems on behalf of our trusted partners, and donate proceeds to your favorite charities.

The key words there being including cryptocurrency mining.

[imaginenore]

It probably mines altoins and then trades them for bitcoin. With a decent GPU you can break even.

http://www.coinwarz.com/cryptocurrency

[dagw]

Even if we assume half load and 12 hours a day, it still adds up to real money if you multiply it by enough users.

[harperlee]

Perhaps it could mine whatever someone wants to have calculated, instead of garbage, in exchange for that amount of money :)

[anonymfus]

They have few hundreds millions users.