Yes how horrible Microsoft the Tech Giant, as opposed to the little guy garage startup Sony
Sony has a market cap of $101.44B and MS has a market cap of $1.839 Trillion.
Nobody said that Sony is a guy garage startup, but it's true that there is a huge difference between them as corporations and that MS has certain tradition regarding monopolistic practices outside gaming.
The market data says that MS is quite far from having a monopoly or even to be market leader in gaming, console gaming, PC gaming, mobile gaming, VR gaming or even game subscriptions, even adding Activision Blizzard King's numbers on top even if we don't consider that ABK's revenue would be massively reduced by including their new games day one on GP and that some of them pretty likely some of them would end becoming console exclusive losing the revenue from the top grossing platform for their AAA games: PlayStation.
For that reason I think that all regulators will aprove the acquisition after investigating the market data, but I understand that seeing them spending around $100B in a few years acquiring important publishers, studios and big IPs, including the top grossing 3rd party publisher and IP may raise concerns on regulators and at Sony specially considering that MS said that they won't stop here and will continue with big acquisitions.
So their concern could be not for this specific acquisition itself but instead for the full list of acquisitions MS had in recent years and will continue having. Again, knowing the monopolistic practices MS had in other tech areas in the past like with PC OS, web browsers, etc.