~~have become~~ became, 30+ years ago

The office-document format wars played out _at least_ twenty years ago.

The path dependence and "everyone uses it" (installed base) inertia of Microsoft's formats continue to benefit Microsoft (and its OOXML formats), despite ODF being more open and, in many ways, superior--not least because it's easier to implement, manipulate programmatically, and reason about.

But refighting that battle seems pointless. Users and the market have moved on, not least toward cloud-based tools; file formats no longer seem the primary barrier to competition.