[mitkebes]

To be fair 30% is the standard.

As far as I know, all of the following stores take a 30% cut:

* Steam * GOG * Microsoft store * Xbox store * PlayStation store * Nintendo eShop * App store * Play store * Kindle store

There's also stuff like Audible where Amazon takes a 75% cut unless you agree to exclusively sell your audiobook through them. And there was a lawsuit over that because it turned out Audible was actually only paying authors a 15% cut, while keeping 85% of sales for themselves.

[john01dav]

The majority (Steam, Xbox, PlayStation, Nintento, App Store, Play Store, and Kindle Store) have a captive market of developers (with varying degrees of enforcement, from end users demanding it (Steam) to it being impossible to use anything else (App Store and the consoles)). This will absolutely put upward pressure on the cut that the market will bear.