You don't get sponsorship from Ron Dennis or Red Bull simply by being born. You got to fund your own Go-karting career first and this requires an insane amounts of money.
Even, Lewis Hamilton, who was an extremely succesful driver as kid, his father had to work 4 jobs and they were struggling financially because all the money was going in just Go-karting. And Anthony Hamilton was an IT manager, which is one of the highest paid jobs in the world.
I have also seen this myself as I used to race myself as a kid. If you think you will compete by yourself by buying a cheap Go-kart and go compete, you are mistaken. I have seen kids who spend $200.000 per year back then (which is probably alot more in 2025 adjusted for inflation) and they are basically like a F1-team, like really professional. And these are 13-year old kids with rich parents.
Without parents who have alot of money, you won't even get your career started as a kid.