Honestly I'd say that is both a part of how the rich stay rich, and also can be classed under exploiting the working class because they don't pay their share and so all the burden falls on the working class, and then we get worse public infrastructure which hurts primarily the working class.
Oh and then the also exploit that public infrastructure for profit while not paying their taxes for it
Bottom chart is missing compound interest. This makes the birth lottery so unbalanced in the first place.
The focus on the hyperrich forgets that there is also inequality between someone who owns a house/has some hundreds k€ invested and the rest of the population. Which will then get compounded in the next generation.
Finally, I do not think it is even close to half/half. In order to be in the position to exploit the working class you more than likely where born rich first.