Books about the elite / modern nepotism

Can anyone recommend me books about the modern elite/modern nepotism and how it works?

I have experienced/observed modern nepotism several times in my life, to give you some examples:

person founds a so called start up with money from person relatives, which boils down to paying other people to do all the work w/o anything resembling a business plan in the first place. Start up is a total failure, person gets job as a specialist for building startups via divine intervention.
at several companies there is a level which people who do the work can reach, and above that level people from higher class get positions seemingly out of nowhere (unless they were childhood/study buddies of someone higher up) w/o any qualification/knowledge/experience to do this kind of work
from a certain level on (at least in IT where we have more than enough money for it) everything is politics; when discussing technical problems/solutions at that level, the first question is always who is the sponsor behind the initiative and if this comes from the wrong party, the technical merits are of no interest at all
a lot of positions even lower level in IT usually are distributed via nepotism/connections, I observed especially SCRUM masters and product owners are chosen for their family names/connections. (Two negative highlights: Product owner was literally boyfriend of company owner and another product owner was son of parent to which company wanted to sell their shit)
lower on the list but still annoying and experienced several times: Son of friend of boss/manager/team lead gets internship in company although better candidates are there and often the nepotism sons would never have gotten an internship on their own merits, but end up with fancy internship from known company on their CV.

I understand that when you deal with a group of people politics are always relevant and inherent to groups.

My question is literately, how does this all work and why is this so extremely widespread?

Anyone can recommend some books about this social systems which give some insights?

Further, when I see what is mounted on money/time/energy because of this nepotism or the current favorite ideas of the elite, how comes no companies (that I know of) interrupt the market with a company slightly less dysfunctional.

Are there historical examples how elites/nepotism was overthrown w/o a bloody revolution?

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