Let's break this down, shall we. First off, barely anything partakes in Google Stadia's Pro service, and Luna from amazon doesn't really have a sub service like that per say (and is still in beta). Remember what I said in my initial post: There is, quite literally, not a single service on the market that is what Game Pass is. When you say "Outriders is on Stadia, but it's not part of Pro" - the real response is... and? So is 90% of every game released on Stadia. Very few of them ever appear on Pro. How do we know it was ever going to be part of that service regardless? We literally have not seen the "marketing" contract for Outriders. We have absolutely no idea what the terms are, so to make presumptions about those terms seems kind of silly doesn't it? How do we know Outriders can't appear on PS +? PS+ doesn't get brand new games like Game Pass does, so how can we ACTUALLY know that's some sort of stipulation? Games that end of up plus end up there after they are no longer selling much.
As for "every service equivelent to PS +"- Game Pass ISN'T equivalent. It's literally an entirely different type of service. Games with Gold is equivalent. However, Game Pass, Game's With Gold, and Xcloud are named specifically, along with Stadia Pro. Granted, right now that term seems to potentially only be for a year - thought a bit vague on the exact length of that term. Even Xcloud... Stadia Pro... are note equivalent services. What they are, are types of services Sony does not offer and does not have a direct answer to at this given point in time. Discluding them from those services is for no other reason, than to not give a potential competitive advantage to other platforms that have more user friendly delivery methods. That's it. It says it in black and white.
As for parity - they have an entire clause about it. They call it feature, content, and technical parity. It lasts 7 years. It goes into detail about technical parity for a line, before veering off into not allowing any exclusive content on any other platform. They said it. I read it. You may interpret it different, I'm just regurgitating their own verbiage.
I am not saying Sony is a shit company. I am not saying Microsoft DIDN'T do this with Outriders. What I am saying, is we don't have any actual proof that's what the contract is for Outriders, but we do have proof of what this contract is and that is all we can go off of. When I mentioned Outriders, it was specifically because someone else brought it up as if we actually know what that contract is.