So much of this is wrong.
1) A studio being bought by another publisher means Sony can no longer have control on what the studio works on. Its crucial Sony gets more PSVR teams as they are a leader in VR at the moment. Third party companies are not going to put much into VR because its a small userbase atm. Oculus, Valve and PSVR largely fund their own exclusives.
2) Microsoft has had many failures in many industries despite going all in and pouring billions into sunk costs. The idea that throwing money makes you win is a complete fallacy.
3) Its hilarious to suggest Sony doesn't have money in the gaming space LMAO. The tenth richest company in the world by cash reserves, with $44B in cash apparently has no money. Mergers are financed with stock and debt. With $44B and Sony stock doing well Sony can buy any gaming company in the world.
4) If MS has such a big money bag then why are they constantly getting dominated by Sony in third party deals. FF7R, FF16, Forspoken, SF5, KOTOR, Ghostwire, even marketing rights COD, GTA etc.... its because money doesn't buy you marketshare. Something MS has learnt numerous times in the past.
1) They absolutely can. All they have to do is make a contract, offer money, and have that studio sign it. How do you think they got the KOTOR console exclusivity? Or the FF7R console exclusivity? Whether timed or permanent, they can get exclusives by going to 3rd party mega companies (EA/Blizzard/Ubisoft) just as much as independent 3rd party companies.
2) I mentioned they failed before, and particularly in recent memory they have focused on dominating industries with their wallet. I'm not talking much about 1990's-2010 Microsoft, moreso about 2010-2021 Microsoft. Also, while Xbox has been third in sales, they have made tremendous profit off of Xbox Gold for many years and now are making a lot off of Gamepass. Who cares about hardware sales when profits are up based on smart software moves? I don't know anything about Groove or MS smartspeakers, which means MS obviously didn't even attempt to make a major splash otherwise those attempts would be well known by basically everyone. I keep up with all kinds of news and so if I haven't heard of those, I'm sure many other millions of consumers haven't either. IE failed after years of complacency, and what did MS do? They didn't give up. They came out with Edge, which is far and away a better product than IE and consumes a lot less RAM than Chrome. Their phone line was a major push that flopped, I didn't say they were perfect just that most of their major investments in recent years lead to domination. They absolutely failed (so far) on the phone front, including their surface phones which have sold horribly due to how expensive they are.
3) Before that ex-boss said what he said, I had no idea Sony was in a struggling situation. I was basing that part solely on what he said about games doubling cost from $100 million last gen to $200 million this gen and how that isn't sustainable for Sony. I assumed that a former boss of Sony would know what he is talking about, but if what you said about their cash reserves is correct then I don't know what he is complaining about?
4) I could spin that part on you bringing up Sony. If they have such a big cash reserve, why did they allow MS to buy Bethesda and all the other studios? Money does buy you a degree of marketshare from studios that want to make the most money off selling, but nothing can buy out stubborn individuals that own companies that don't want to sell or don't want to sell to a specific company. I'm sure there are companies that would't want to sell to Saudi Arabia, or EA, or Tencent for moral reasons, and then there are companies that wouldn't care because their owners want to make the most money. Then you have countries that have laws preventing international takeovers; I have heard Japan has some laws preventing that sort of thing. I think Microsoft would rather own a studio than make exclusive deals with them. That whole Platinum dragon game probably made them hesitant to make those sorts of deals with companies they have virtually no control over. Not saying they won't or don't have those deals in place, I just doubt they will happen very often on a AAA level, whereas Sony is very willing to do that. That leaves Sony able to make those deals by adding a bunch of cash to prevent a multiplatform release (or at least a timed deal). If MS bid on the same game to be exclusive or not to their platform as Sony, there is absolutely no way Sony could win that bid battle.