This isn't a very honest statement, either. Your choices for mobile platforms are Android and iOS. That's it. That is not a free market; that's a duopoly, and stating that you have a "choice" is, while literally true, misleading to the point of being disingenuous.
Moreover, it's extremely clear that Apple is not pursuing the edge of the security-freedom efficient frontier, but is intentionally sacrificing freedom in order to lock consumers in to its ecosystems, acting in ways that are clearly anti-free-market and anti-competitive and are entirely deserving of lawsuits like the one in the posted article even if there was more competition than there is now.