There's a pretty big difference between just releasing a new game on a new storefront, and pulling a game (or games) from an existing storefront so it can be exclusive to that new storefront. Weak approach to "competition" if you have to buy your way to relevancy with zero other value to the customer.

To be fair I have basically zero trust of digital storefronts - for example, Steam will no longer run on my still-very-recent MacBook (OS X 10.10), so I can't play any of the hundreds of games I "own" on there anymore.