That would be an incorrect assessment on grounds that Capitalism has its roots in late feudal system of land proprietorship which was present in late 18th century Britain. And as the industrial revolution advanced, the same system which existed for feudalism was applied to newly emerging industrial economy with minor modifications – the relevant one here being removal of serf system so that workers could be disposable in the new fief that was the Factory. As being a noble for owning land was not a requirement since a long time ago and any peasant could rise up to a certain rank of nobility after amassing a certain amount of land (namely and most important, the position of Knight, and the responsibility to provide 1 knight, his armor, ~4 horses and 3-4 apprentices to support him in war, which many up and coming newly made rich tried to avoid due to being expensive), feudal system didnt need to be modified while going into Industrial Revolution.

Thus, the analysis that says capitalism is rigged in favor of rentier class is incorrect in that capitalism is a system that is built on, and for the rentier class, therefore it is not rigged – it is the nature of the system.

Old feudal landowners who owned the capital and had the serfs or peasants work on it and collected rent, transformed into new entrepreneurs who owned factories and had workers work in them and got most of the produced value. Autonomy which a serf would have in using his farming land was removed and the entire system was transformed into a private tyranny.

Ultimate evolution of Feudalism. The factors which were binding feudalism in chains and preventing it from transforming into what we later named Capitalism were that slavery was banned by Catholic church at the advent of Middle Ages, hence bettering position of serfs and common law deriving from those cultural developments which turned the fief into a revenue-share in between the lord and the serf by dividing the produce in between the lord, serf and the church. Even if the lords abused it as much as they can.

Once these limitations were circumvented with the advent of Industrial Revolution, Feudalism evolved into its final form.