You don't think that's a normal cut for businesses? That's the same that Google charges.
Service fees - Play Console Help
Apps and in-app products sold through Google Play’s billing system or an Alternative Billing System (as defined below) in accordance with the Payments policy are subject to a service fee.support.google.com
Apple, Google, Steam.. they all take the same cut, A piece almost third the size of the pie. There is nothing normal about this. Nothing. Nosireebob. And the fact we’ve become accustomed to this should be a big red warning flag.