I wouldn't say libertarianism is "dead" but rather is quick to fall prey to logical contradictions justifying totalitarianism, similar to the two prime time political teams.

You're right that there is little difference between a corporation that one is de facto forced to interact with, and a bona fide government. For example, one can easily reframe USG as a corporation that you form a contract with by owning land, renting, or being on a public way. This does not mean that our current society is a libertarian paradise.

Turing completeness shows us the ouroboros of expressivity with programming languages. It's unfortunate people let their guard down in other areas.

Libertarian thought is complex, non-static, and (importantly), non-monolithic. This is especially true for the relationship between people, government, and corporations. The generalizing statements in this thread reject vast swaths of ideas for no reason at all; even ideas that generally agree with the ideas in the thread. My guess is most people hold in their minds a caricature of libertarianism informed either by "that one libertarian guy from college" or social media postings. That's somewhat deserved, but also a shame.

Many people associate the word "libertarian" with right-libertarianism, which is the predominant form of libertarianism in the United States. Ayn Rand's philosophy of objectivism is right-libertarian.

https://en.wikipedia.org/wiki/Right-libertarianism

https://en.wikipedia.org/wiki/Libertarianism_in_the_United_S...

https://en.wikipedia.org/wiki/Objectivism_and_libertarianism

On the other hand, left-libertarians oppose capitalism while supporting personal property rights. Left-libertarians and right-libertarians find common ground in rejecting authoritarian governments.

https://en.wikipedia.org/wiki/Left-libertarianism

Libertarianism comprises a diverse collection of views that aim to advance individual freedom, and anyone who is not an authoritarian is likely to agree with some libertarian principles.

Can a corporation reach into my bank account and take my money via civil forfeiture without a trial? Can a corporation in prison me? Can a corporation break into my house without identifying themselves and shoot me? Can a corporation stop me while driving down the street for “fitting the description”?