I mean not really. Capitalism is when merchants and the like (a class that has existed in almost all societies for most of history) controls the means of production. In general people don’t come up with systems; systems emerge from the material conditions societies live under. It’s not like someone sat down with a pen and paper and worked out feudalism for example; it’s (oversimplification incoming) just what you get when the most productive assets of society are agricultural land. Conclusion: All systems are like shower mold.

a decentralized egalitarian society was implemented with over 3 million people in 1936 Catalonia during the Spanish Civil War. By all accounts it worked extremely well, and did not suffer from authoritarianism or genocide.

Simply not true. Maybe every time we try a new system as a reaction to capitalism, but people have been self-organizing and participating in gift economies for as long as there have been people. You literally wouldn’t exist otherwise. Mutual aid is a factor in evolution

China quietly moves the tanks out of the room and pretends you didn’t see.