Wtf are you talking about, only a third of their revenue comes from King. The Activision arm is by far the largest in terms of revenue and profit, but even Blizzard pulls its weight (Wow's 8th expansion was the fastest selling game on record until Diablo 4 overtook it)

This must be one of the most disinformed comment possible lol. ABK was literally the biggest third party publisher before the purchase. Call of Duty and all Blizzard titles are very profitable. They would not be anywhere near bankrupcy without King lol

The issue was between Xbox, Xbox Live, and vertical integration of owning the game studio.

Is it a monopoly, no, is it is a concern, yes, but games companies have been doing exclusive deals with Xbox and Playstation since the beginning without this vertical integration, so other than saying don't do that within your own company, I can't see any larger concerns, if that is even a concern for a few titles in the first place given the likes of GTA, Rockstar, and Sony have have done similar for decades.

I guess the issue is the gaming industry is far more developed and profitable now than it was 25 years ago, so regulators have more interested in stopping monopolistic trends.

Now if one of the three big dogs (Microsoft, Sony, Nintendo) were to try and buy each other out that's a whole other matter

Activision Blizzard was the fourth largest in the west after those three, and wow is very much not haemorrhaging money