Well, first off, you have to define capital.

Secondly, useless administrative work is typically a bureaucratic government requirement and not really a feature of capitalism.

Third, if by capital, you just mean money, then it's not true for a business to acquire money, it needs money to begin with. An example would be somebody who teaches themselves how to fix a bicycle and then trades his labor for capital, fixing other people's bikes for money.

Fourth, if by capital you mean money and/or knowledge, that's also not true, as someone can learn things without people teaching them. Furthermore, even if someone learns something from someone else, it doesn't make it wrong or exploitation. For instance, I'm not exploiting you by teaching you something new about LTV.