With these kind of acquisitions, other companies are going to find it very hard to compete with Game Pass. I think we'll look back in 10 years and wonder why antitrust regulators did nothing, but it may be too late by then.
It'll depend on the perspective. For the gaming industry, this seems to push Microsoft into 3rd place (by size) behind Sony and Tencent. So hardly a monopoly and akin to T-Mobile's acquisition of Sprint a few years ago. It makes Microsoft much more competitive against Sony and even Nintendo since it'll likely bolster their 1P offerings in the future. But if Microsoft uses their ownership to favor their own game subsc…
The only reason it got approved the third time was that regulators were convinced that either way, the US would only have three mobile operators because it did not look like Sprint could be a going concern.