Actually, now that I think about it - MS can buy whatever they want considering that home console gaming is a part of the gaming market which is 160b market. So with 20b+ revenue it is literally just 12% of the all market share. It is the same thing as with anime - Sony literally owns a real monopoly on anime but as it was considered as a part of cartoon market, it went just fine. And unlike Sony - MS does not have monopoly on console market.
World of Warchest.
Sony does not own a monopoly on Anime. It's literally impossible to based on the laws in the US. Don't know about other countries. Sony is not preventing anyone else from creating animes. They are not preventing Hulu, Disney+, Netflix, Peacock, Paramount+, HBO Max, etc from having their own Animes.
But people here are screaming it's a monopoly.
People do not know what monopoly is. People do not know what antitrust is.
In the US it pretty much comes down to 3 things
Sherman Antitrust Act - basically created due to railroads in the 1890s
Clayton Antitrust Act - amended the Sherman Antitrust Act in 1914 to include a ban on anticompetitive prices and mergers
Herfindahl–Hirschman Index - used to determine the concentration in a specific market
In specific instances (for example broadcast) there have been rules explicitly called out. For example, the same entity cannot own any two of the following: ABC, CBS, FOX, NBC. An entity may only have local television stations in a certain percentage of the market and so on.
If HHI was used for Console Game Market then Nintendo, Sony, and Microsoft would be required to divest their subsidiaries as that would be a highly concentrated market. If it was used for games industry then it'd probably still give us a medium to highly concentrated market.
As you can see the definition is very broad which takes me back to monopoly and antitrust. There's no definition on what percentage makes a monopoly in the US for any specific industry. There's no definition of what an industry is, so going back to Microsoft buying Activision what industry is that a part of? Is it the console game industry? Is it the game industry as a whole? Is it the entertainment industry? I would argue it's the latter. Games compete with movies and tv shows for consumers money, time, eyes. It's the same argument people tried to make that Disney would be a monopoly by buying Fox based on domestic BO percentage (and even that by itself wouldn't make it one).
Usually when a merger falls through is because the company responsible for defending the merger does not want to spend the resources when the government sues to block it (i.e. Comcast - TWC). When they do want to fight it then they usually, if not always, win. There's a reason Lina Khan and them are trying to introduce a new antitrust bill and why Ted Cruz spent 40 minutes talking to Tim Cook about it.