Tangential: what other downloadable software makes (or, tries to make) money with "revenue share"? I'm aware of these not-downloadable-but-is-digital services/

Tangential: what other downloadable software makes (or, tries to make) money with "revenue share"? I'm aware of these not-downloadable-but-is-digital services/stores/platforms that do: - app stores (Apple takes 30%, Google takes 30%) - content (YouTube keeps 45%, Twitch takes a cut) - e-commerce (Etsy 5% transaction fee; eBay takes a %) - music/podcast (Spotify; SoundCloud) - e-learning (Udemy; Teachable) - gaming (Steam takes 30%; Epic takes %12) - rental (AirBNB service fees; Turo commission on each car rental) - freelancing (Upwork's sliding fee; Fiverr takes 20%) But Unity is DOWNLOADABLE software, not a platform/app-store/SaaS. So, why revenue share? Surely most devs just make free-standing/downloadable games that don't tie into any platform-y features? AFAIK, even Unity Enterprise [0] is just source code, support, 3-year LTS bug fixes, and the only real thing that's platform-y is the build server, which seems to cost extra anyway. 0. https://unity.com/products/unity-enterprise https://unity.com/products/unity-enterprise