The thing for me is and always will be that as a platform, all the other 'stores' have a garbage UI and look like total crap. Steam is sleek as shit, and it's been around for forever so I know where everything is. And then I look at other stores and it's all just super clunky. If I get the choice between pirating and steam, I'll get it on steam most of the time just because it's more convenient. With the other stores, that really isn't the case, and I'll go out of my way to pirate instead.

That said, I also don't particularly feel like bloating up my laptop/computer with 200 different gaming platforms when 1 does the trick and does so far better, lol.