No, but I'm sure you're aware that publishers/developers can make versions that run on each platform and license them in more consumer-friendly ways. I've bought non-SaaS desktop apps that come with license codes for each platform. If not included, there's often a discount for buying licenses for multiple platforms. And this doesn't require me to create an account for phone-home license validation. That type of license bundling is not so easy* and definitely less common with walled gardens.

* - I am taking developers at their word on this. I haven't sold anything on the Mac App Store.