Interestingly enough GOG takes 30% and has had periods they struggled.

The storefront saw a slight increase in revenue but a net loss of around $1.14 million in the last financial quarter. Overall, it’s lost about $2.21 million over the past three quarters compared to a $1.37 million profit over the same period in 2020. CD Projekt didn’t immediately reply to questions about how its new strategy might translate into changes to GOG’s features or catalog.

One staff member tied the earlier layoffs to increased competition in PC gaming storefronts, which has driven major platforms to lower the commission they take from developers.

https://www.theverge.com/2021/11/29/22808199/cd-projekt-gog-losses-restructuring-earnings-2021

Funny thing is lower cut is likely to benefit steam more by killing off the competition for good with the economies of scale they have on their side compared to competitors which themselves are running at a loss and not clear if the cut is sustainable in the long run to justify running.