Are Both Socialism and Capitalism Ideas That Have Never Been Tried?

Have all regimes to date simply been some form of crony capitalism?

(From FEE)

Since around 1800, in countries that have historically most closely approximated capitalist economies, real GDP per capita has increased by a factor of almost 30 (that’s 2,900 percent!)…

…In the longest-standing real-world approximations to socialism, by stark contrast, the best-case scenarios have been economic stagnation, but more typically, economic ruin.