I don't see how you can argue with the courts that the bandwidth cost to serve a 100mb zip file is $4. That's beyond egregious
The four dollars is for providing the platform that the user used to navigate to the link and download the zip file.
That's a fun bit of argument from the owners of Chrome.
These rules aren’t for linking out from the store to a third party site, but rather for installing an app from the store and then linking out to a third party payment.
And does not include showing up first in search results for your app's name. That's a separate fee you'll need to pay.