I was about to argue that in a free market, 30% would never be a reasonable price, but then I looked and that's what Steam charges and they have multiple viable competitors on the same platform, so now I don't know.
From what they posted, 30% is not the main reason of their complaint. I guess it's more about that they now have to face Apple Music, which has such a huge advantage over them, no fee, better OS support, .etc.
Steam has been hemorrhaging publishers as of late for exactly that reason, and has started offering larger publishers lower rates. That probably still won't be enough.
But hosting full games is a different story than hosting apps. Not to mention that Steam offers more features, such as cloud saves and an entire social network.
