Why would the Microsoft and Activision Deal go through?

As we all know, Microsoft made a bid to acquire Activision Blizzard for $68.7 billion, or $95 per share.

In the United States, Microsoft posted $8.7 billion in revenue for the gaming segment, capturing 10% market share, making them the largest player in the US market ahead of Sony (8.1% market share), Nintendo (6.8%), and Activision Blizzard (5.5%).

If the deal were to have gone through last year with these results, Microsoft would have a 15.7% market share in the US gaming industry, making them the largest player ahead of Sony by 7.6%. The industry is highly competitive and has about 49,467 firms.

15.7% market share sounds like a lot, however I have a hard time believing this deal wouldn’t go through. If we take a look at other industries like “Online Payments,” “E-commerce,” and “Online Mortgage Brokers” to name a few, their largest players have upwards of 59% market share. Is there any reason why the FTC would block such an M&A deal??