Um I don't think they had that much profit to donate though. Remember that they said this semester's lectures were just to get the name out there and they weren't focussed on profits. From their own video: "How are we going to offer you all of this for just $47? ... The answer is two-fold... Because we're a relatively new provider, our goal is simple: to get as many people to see the incredible value we're providing... Keep in mind, later on, we'll have to increase them [the prices] significantly to be competitive."
It's pretty obvious that they weren't expecting to make any profit really anyway, so this is quite a hollow gesture. Call me cynical, but I'd say it was masterminded with this effect intended. "Oh my god how wonderful and charitable!" Seems like just a PR exercise to repair the beating taken to their image.