Apple forces me to stay there.
Valve offers me to stay there. The whole market and review system is incredibly important as I can see if it's even worth it to buy. Where else can you see reviews besides comparing numerous comments under video reviews?
What exactly is the value that steam provides with its 30% cut that Apple doesn’t provide? Not defending Apple by the way.
Openness of the hardware is a valid point but that isn’t exactly a feature of steam (nor a distinction between the other platforms in OPs comment)
Apple forces me to stay there.
Valve offers me to stay there. The whole market and review system is incredibly important as I can see if it's even worth it to buy. Where else can you see reviews besides comparing numerous comments under video reviews?