Why are there fewer and fewer inventors?

It's not that there are fewer and fewer inventions, but that the big inventions are all registered patents. Compared with the small inventions, such as the Daoxiao Noodles knife sold in the market, this small invention allows ordinary people who can't make Daoxiao Noodles to eat Daoxiao Noodles. Many small inventions are just not as loud as the advertisements.