As I see it, fully voluntary socislism where people share and cooperate because they just feel like it, works exceedingly well. It also naturally regulates itself as people will just abandon stuff that looks iffy and work extra on stuff that is well run, fair, etc

When you force people to pitch, share, cooperate, etc, things start to don't work out so well and you start getting people that takes advantage of a system that mandates others to work for a cause no matter what, as well as people that will do whatever they can to not do their work.