Monetize apps in other ways

Hello gelera, good afternoon, I would like to take a doubt with you developers, We know that the policies of the app stores are increasingly demanding, I would like to know if we can, for example: If we have our own sponsorship or partnership if we can put links to access externally the sites, I know it’s possible but the question is whether the policies will prohibit us to limit ourselves to just admob ads and others and subscriptions in the apps, making it so that we can’t do our own advertising in the apps, I know it’s not very well seen this practice across app platforms. If anyone knows any way to monetize apps other than ads, paid or subscriptions, I would like you to share your experiences. thank you!