If you follow it to the logical conclusion, it's nothing more than repackaged original sin. All wealth, all income, is stolen from someone else with less, therefore you are all evil without exception to the extent you have anything. It's a liberal form of original sin (for humans to thrive we must alter our environment, we must save, to the extent you manage to accomplish that, you're evil, therefore you're evil for existing).
Keep in mind of course that China nicely disproved that premise in approximately the most dramatic way possible from ~1990-2020. If the pie were actually finite and had to be divided, swapped around, then China's extreme rise in wealth would have wiped out the equivalent of all of Western Europe's wealth combined.
Absolutely not. This is, in today's world, a perpetual cycle. Pay not keeping up with inflation, yet consumer costs across a wide range of vital services keeps increasing. This keeps the poor poor(er) and the rich rich(er).
In China they do get to keep more proportionally, as a class. That only happens because they form the ruling class.
Just because revolutions are more likely to happen in poor countries doesn't mean the revolutions caused the poverty.
Of course, the ruling class of capitalist countries are incentivised to use their considerable power to lie about any socialist project and portray it as evil.
I always found it amazing to hear about workplace councils that could fire the boss or the very low rents.
What does that even mean? They buy up factories and let them sit idle?