33 Million units at ~$20 is $660 million in revenue. This isn't including development costs, which are low for Minecraft but not zero (I'm guessing $5-$10 million over its lifetime.) Subtracting GTAV's combined development and marketing budget of $265 million still puts it ahead of Minecraft at $735 million, and it still has a lot more runway left.
A cut through the iOS store, a cut through the Google Play store, a cut through Xbox Live Arcade Marketplace.
The IGN article says Minecraft sold 12 million on PC, so it's paying cuts on the other 21 million.
The Mojang and Notch AB financial records are public -- as it is the way Sweden works -- by the way, if for whatever reason you want to look into the money that they're making.