I love the fact that you cross-referenced a post of mine form 2015 to label me as a communist/socialist. Nice
I shall also start a sentence with "in practice".
In practice, under capitalism the world has seen wealth and monetary distribution flow from the bottom to the top, always. Especially this is true of the past decade since the "financial crash". The elites have been increasing their share, to the point now that less than 1% of the population own >50% of all wealth, money and assets. With this share significantly increasing year on year.
Not only that, but our legal system has locked in their power and control. In many sectors now new entrants are locked out due to the overwhelming control and power of the biggest corporations. Examples include Monsanto, etc.
Capitalism as practised currently endorses, encourages and rewards unshackled greed without restraint. That's
is reality. And our legal system is currently allowing itself to be influenced directly by lobbyists and donors - those with money to burn. No surprise then that our justice system is so obviously two-tiered (or multi-tiered). There are of course countless examples of the legal system being used to bankrupt a smaller competitor - even when there is no valid legal complaint to begin with. The use of the legal system to bankrupt those with less wealth is not an uncommon tactic!!
I really don't need to start listing examples of pension funds plundered, or companies where the owners have extracted all cash reserves and assets, then let the company fail leaving their employees with no jobs and no pension (oh but the govt can bail out the pension so it's all A-OK).
Lastly it's well documented that the very poorest in this country, and other capitalist countries, have been seeing their living standards drop. We've been moving steadily backwards towards the Victorian era Work Houses.
Additionally the up-and-coming capitalist societies of India, etc, are not seeing living standards for the poor rise in line with the country's overall increased wealth. The "trickle-down" model is once again failing. Whilst India, Africa and China now have thriving middle-classes who all drive BMWs, these also staggering levels of poverty at the bottom. But once again we see that human nature is to take care of yourself, take what you can, and enjoy it.
Capitalism rewards selfish behaviour and self-centred outlooks. By design.