The answer is very obvious. Government intervention.
Who says the poor can’t afford more children than the rich? Have you take into account political costs and political subsidy?
The poor can afford infinite number of children due to welfare. A billionaire can hardly afford more than 5 due to child support rules that set man’s obligation to be proportional to man’s wealth/income.
In fact, imagine if government says that all chultu worshippers will get subsidy if they have children and all flying spagethy monster will have to pay $50k child support per month per child. I bet chultu worshippers will produce far more children than worshippers of flying spagethy monster.
the problem is not just islam or religion. It’s an everlasting problem. Class struggles if you call it.
Everyone wants to rule everyone else. That includes ensuring that everyone leave everyone else the fuck out alone (libertarian), ensure that everyone pay more money to them (socialists), ensure that no body have fun without their approval (conservatives). Yada yada. Power struggle between slaves and slave owners. It’s never ending.
I think the biggest upset that billionaires cannot do is the most important thing money should buy. Billionaires cannot afford his own biological children without risking his whole wealth. In particular, billionaires cannot simply afford many (say, 20) biological children.
Okay some comparison.
There are 2 types of billionaires. Females and Males. Obviously female billionares cannot have 20 biological children, nor can they do so on 1900. So let’s ignore the trivial case.
In 1900 China (not sure about europe), it’s simple. Have tons of concubines. Have tons of children. Period. It is easily done. Many are actually doing it.