I dont think this even needs a comment.
Ok, it makes perfect sense for them to make a store where they will get 100% from their own games, but Valve has 2 decades of headstart and tens of thousands of games, they still pull more money from steam than from their own stores. Nobody will fully migrate away from steam just for a few dozen games and many games arent even maintained or actively published, so theres close to zero chance they will ever be added to another platform, even if they did customers will not abandon their already existing libraries and rebuy stuff elsewhere (brand new users might). They might buy a few games there, but unlikely they will make it their primary plaform which is what would be necessary for the scale you propose.
Whoever tries next will have even less products to offer, not to mention they would start behind epic, gog, EA, ubisoft and others, would anyone greenlight a project that was tried by many others and failed? The risk is too high, industry is too volatile, competition is too ahead and entrenched in the culture, it could take decades for returns to manifest, a lot of workforce is necessary, they have very little experience on PC, the operating investment is too high, the starting investment is even higher.
A small storefront for the purpose of maximizing profits makes sense, competing head on against valve is a lost battle even though sony is well equiped. Pretty sure they are aware of epics forecast for their store breaking even and starting to be profitable (spoiler: its a long time)
Exactly, their goal will have to be maximizing the margins from a few users.
Not enough people care and you listed competition
True, but a few games (they dont really have that many each gen as shown they have no intention of porting their entire old catalogue) dont matter as evidenced by the failiure of ubisoft, EA, Epic and others, its about all games in total on this scale. Theyve all tried exclusivity and look at how it worked out, 70% of many sales is better than 100% of few sales, but whats even better is 70% of many a sales with a possibility of getting the full 100%
Wait... thats just a description of Steam
Even microsoft has failed and they have some big advantages over steam since most people use windows or is microsoft also too small?
My prediction is that sony will make their own store where they will sell their exclusive titles and they will be successful at selling those while still selling stuff on steam, if they put 3rd party stuff there it will sell extremely poorly. Making a major investment in a windows store helps microsoft and is likely not a part of their business strategy, best way for them is to focus on Playstation and not waste money on overly ambitious and risky ventures. I do want more competition for steam, but people have been rejecting every attempt for decades, i do not expect that to change unless cloud gaming somehow becomes mainstream.