[kderbe]

Some of these platforms are less closed than others. Steam, for example, will give developers "Steam keys" for free to sell on other platforms or through their own storefront. So a developer can sell on Itch.io which only takes 10% (IIRC), the customer can use their preferred game client, and Valve pays for the bandwidth.

Can you imagine Apple or Nintendo doing such a thing?

https://partner.steamgames.com/doc/features/keys

[kderbe]

Correction: Itch.io lets developers choose their own revenue split. It's 10% by default but sellers can choose any amount, even 0%.

https://itch.io/docs/general/faq#why-buy-on-itchio