Not really irreversible unless they get a monopoly on violence, so as long as the overton window from the publics perspective shifts dominantly towards breaking them up in the future we'll be able to get a better situation.
However, Very Bad Things™ can happen long before they have monopoly on violence. And violence where? Large companies operate in weak jurisdictions, not only in their home states of Maryland and Ireland.
Nobody (company, nation or gang) needs a monopoly on violence to become dangerous.
Also, the Medici family was initially a wool company, then grabbed power in their homeland, kept it for about three centuries and somewhere along the way produced descendants that ruled over much of Europe. Similarly, the fascist uprising that gave power to Franco over Spain was largely privately funded by a bank [1] and I seem to remember that the German Nazi party was largely funded by industrialists and bankers [2] until reached power.
So, I'd say that companies overthrowing their home country's government has unfortunately been a thing for quite some time.
[1] https://en.wikipedia.org/wiki/Juan_March
[2] https://www.bibliotecapleyades.net/sociopolitica/wall_street...
Part of the job of being a consumer of media is understanding the bias of what we're consuming, determining whether it skews the news, and possibly counter-balancing by consuming other media with different bias. And yes, it's lots of work and most people aren't willing to spend the time doing that.