Microsoft and Playstation also allow for cross-platform play, and crucially unlike Apple, actually provide a significant amount of services to developers for their cuts, including but not limited to QA services, SDK and hardware support from actual MS/Sony employees, and marketing spend.
Additionally, while MS and Sony require all developers to use their stores or APIs for IAP, they allow developers (at least large ones) to heavily customize those storefronts, and charge significantly less than 30% for the enforced privilege of using their IAP APIs; the exact rates being a matter of negotiation.