I think it's basic economic illiteracy driving the problem. People think communism is when you have one producer, but it's when you have one customer. It's a centrally-planned, single-payer system.

If you have one producer, but lots of customers, market forces can cause competitors to arise, if the customers are unhappy with the products. If you have one customer and lots of producers, the customer will find it simpler to just pick one or two producers and focus on them, and the other producers go away. The producers that survive can then become decreasingly productive, without losing market share.

And the clearest sign of communism is when the producers regularly declare that things are impossible, that aren't even improbable. That are, in fact, perfectly normal and simple things to do.