Guys and gals, I didn't think they existed, but I found one. A Valve/Steam fanboy
Kidding aside, at least you're entertaining competitors enter the space. Meaning you shouldn't be adverse to someone like Sony doing so, if they did it the right way. Even if that's an inconvenience for Steam fans like you at first, worthy competition would inherently produce better results in the long-term.
Trust me, if Sony seriously wanted to offer a competitor to Steam, they could do so and probably usurp that market like they did with the console gaming market when they entered as a platform holder there. It's just my personal POV that if they have such an interest, it's 10+ years out from now, and for the time being their overall strategy would be better off de-emphasizing platforms like Steam for anything outside of legacy/catalog remaster compilations and GaaS titles.
There would be obvious adjustments, such as accounting for no paid online for starters. You're conflating a Sony PC storefront with console PS+ and assuming no changes would be made.
Who's jealous, exactly? The Steam fanboys sniveling and crying for ports of Sony 1P games when their purchasing power can't even account for the majority of a paltry $200 million revenue from the previous FY that was carried PC-wise by Destiny 2?
It's funny how some of you want to talk facts until the data becomes inconvenient, particularly once the actual impact of PC is brought into the picture. No one here's crying for PC exclusives to come to PlayStation, which is where that 'gotcha' phrase would apply, if anywhere. Valve/Steam port-beggars are throwing flimsy reasons as to why Sony should continue the current strategy as-is or expediate the strategy, and the rest of us are just serving them with facts that wreck that idea apart.
If you want to be on the side getting a reality check on the topic, be my guest