Those peasants had not even have the passports so they were unable to leave their place of living.
That's true - my grandparent's passports belonged belonged to kolkhoz chairman - they were not allowed to move - especially because they have been deported and were considered "enemies of the state" by KGB.

If UK and other colonial powers colonized places with a lot lower living standards than their country - USSR did the opposite - they looted places that were richer than their country - Baltic States, Finland, Poland, Germany, Austria, etc...
There will be no market if communism would be everywhere
That's why I put word "market" in quotes.
If there will be no money and no market in capitalist sense, etc.
How new products will appear in stores?
How they will be manufactured and who will decide what to manufacture, what to replace, and what new to introduce?
Nowadays free market does that quite good - people "vote" with their wallets.

And Hanna - you mentioned sweatshops - but nowadays they are mostly in undemocratic and totalitarian states like China.
And after USSR collapse - we do not have to work in sweatshops - at least my family lives a lot better than we did under Soviet occupation.