There won't be any.

I'm old enough to remember this happening: https://en.wikipedia.org/wiki/Standardization_of_Office_Open...

Basically, Microsoft furiously bribed their way into formally standardizing the utterly broken MS Office formats, so EU and potentially other regulators couldn't mandate them to be "interoperable" with existing standards (e.g. OpenDocument, based on OpenOffice, which was on its normal way to become standardized with no fast tracking and no bribing). They even called it "Office Open" to foster confusion.

They can do whatever they want and get away with it because a big part of their business model is, much like Oracle and SAP, based on bribing government bodies across the world.

Yes, but this time there’s the additional driving force of countries trying to become more self reliant and not get locked into US software giants (France and Germany for example). A long way to go, but it’s gaining more traction than the past half-assed attempts.