If you want to play Sony's games on PC, you'll have to download a launcher. VGC verified the code that was found in the Windows version of Spider-Man. The discovery is related to the recent revelation that Sony plans to integrate the PSN into its PC titles.
It is not clear if Sony will make its games exclusive to the software if it goes ahead with the launcher. It is possible to buy all of Sony's PC titles through both steam and the games store. Publishers use different strategies. The Battle.Net app is the only way to get the games. You need to install their software for verification if you want to buy and download their games through other companies. It is almost certain that Sony will have a storefront even if it goes the latter route. The company could not give a cut of its PC sales.