There's no way to know if Drake did it out of the goodness of his heart or if he used this as a way to get some publicity. Only he knows that. But based on what I've seen from him before, the notion that he did this for publicity isn't outrageous. He seems like an attention hound. But I guess in the grand scheme, it doesn't matter all that much why he did it. The sick girl loved it and that's a good thing.
And he spared 10,000 people from having to listen to his awful crap. I'm sorry, but I grew up in the golden age of rap music and I'm a big fan. I consider myself well versed on hip hop from its inception to about the year 2000. And what he puts out is not what I know to be rap music. It's dreadful.
I like Drake but even if you don't he is 100 million times better than these mumble rappers and skittles looking MF's out there now.