Yeah, you can opt to target only one of them, but you're (usually) going to get out competed by a company that targets both.
There are plenty of markets and Technologies I won’t touch with a ten foot pole.
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.
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.
Instead of using an OS (iOS in this case) with 25% market share that forces you to go through their AppStore, you can choose to use Android (which has 75% market share) and side load apps to your hearts content.
reference: https://gs.statcounter.com/os-market-share/mobile/worldwide