VCs are run by people with big pockets. See the softbank's vision fund for an example. VC funds typically involve Accredited Investors, who all have big pockets, rather than the rest of us:

https://www.sec.gov/resources-small-businesses/capital-raisi...

As for capital markets, I had misunderstood what the term meant when I replied, as your definition and the definition at wikipedia at a glance looked like it described the lending portion of fractional reserve banking and I never needed a term to discuss the individual "capital" markets collectively. Investopedia has a fairly good definition:

https://www.investopedia.com/terms/c/capitalmarkets.asp

I am going to assume that by capital markets, you really mean the stock market (as the others make even less sense for getting a new business off the ground to produce something new). Unfortunately, a business needs to be at a certain level of maturity before they can do an IPO on the stock market. VC exists for the time before an IPO can be done. Once they are at that size, the stock market can definitely inject funding and that funding could be used for R&D. However, share dilution to raise funds for R&D is not sustainable, so funding for R&D needs to eventually transition to revenue from sales. This would be why the various inventions I had listed had not been funded from capital markets. I imagine many other useful inventions had not been either.

That said, the stock market also is 90% owned by the wealthiest 10% of Americans, so the claim that "Capital markets exist by pooling in the savings even by poor and middle class households" is wrong:

https://seekingalpha.com/news/4464647-deeper-dive-the-wealth...

In any case, despite your insistence that money does not trickle down, your own example of capital markets shows money trickling down. The stock market in particular is not just 90% owned by the wealthiest Americans, but is minting new millionaires at a rapid pace, with plenty of rags to riches stories from employees at successful businesses following IPOs.