Forcing "an-capistan" would result in great wealth disparity, some horrific monopoly companies cornering markets, and death due to lack of services for the poor.

While that is similar to communism on the last part, not everyone will be poor. Further, since productive clever people will be able to use their gifts for their own benefit, they will. They will raise themselves because they can. Contrast this with communism where their abilities benefit the greater good first, and much less flows back to them.

Really the only forcing are the rules of property and law. I'd say that doesnt compare well with obligatory communism, which is for some reason more likely to take away your property than to grant you access to something you lacked.