Well, let's say that I could hypothetically buy both the Google store and the Apple store, and I raised the percentage cut from 30% to 95% on all sales.

I'll even make it so that all apps are automatically available in both stores! And I'll use the revenue to buy out any competitors, or sue those who I can not buy.

would that still be fair? After all, I am providing a service, am I not?

I think the debate here is not about whether or not there is a service being provided -- but rather what kind of service fee would be "fair" in exchange for the service they provided, while acknowledging their (near) monopoly on android users.