It's actually industry standard for the publishing platform to take ~30% as the article says. XBLA, Steam, and PSN all do this as well.
It may seem like a lot, but those users wouldn't be available to you without the platform supporting you.
It may seem like a lot, but those users wouldn't be available to you without the platform supporting you.
Whether Facebook intends to go that way or not, people seem to be assuming it will.