Well of course both companies would want each other out of business. The difference for me is, Sony at least have done what they've done for PlayStation, for the most part, leveraging the strengths of the actual division. The 3P exclusivity deals, hardware R&D investments, marketing efforts etc. have been done with a mix of PlayStation's own valuation within the company, which I would say is accurately reflective of its revenue and therein its profits as a division/subsidiary of Sony.
Microsoft have made the Zenimax & ABK purchases based off no merits of Xbox itself as a division; rather, they're turning to their much more lucrative divisions, leveraging their revenue, profits, and market valuations, to pump all of this excessive money into Xbox itself. What's more, they don't even actually "need" gaming revenue in the way Sony or Nintendo do. There's nothing saying what Microsoft is doing in that regard is illegal (otherwise they'd be prevented from doing it in any market), but I can choose to respect Sony's method for gaming growth and turn my eye to Microsoft's, because one's based on merit of their performance in the gaming market, and the other simply is not.