Any system that gives a relative few authority over everyone else will sooner or later become autocratic, simply because that power inevitably comes to be held by those who desire it the most and are most willing to do whatever it takes to gain and hold it, and they tend to be greedy, power-hungry, dishonest, amoral assholes.

As far as that goes, the only real differences between systems are the specific hoops the assholes have to jump through.

Broadly, in a capitalist system, political power is awarded to the wealthy, while in a communist system, wealth is awarded to the politically powerful.

So the greedy, power-hungry, dishonest, amoral assholes follow different paths in different cases - accumulating wealth with which to buy access to political power in one or climbing the ranks of the ruling party in order to gain wealth in another - but the overall dynamic is always the same.

And that’s a large part of the reason that I’m an anarchist.