In my experiences so far, people's wealth often has nothing to do with business success.
I say often because of course a tiny fraction of wealthy people are successful after spending an inherited fortune, but more often than not success seems to be genuinely earned through hard work and trial and error.
The 'rich parents' argument seems like the same cop-out as "it takes money to make money" rubbish that people still spout today. After all, it's never been easier to build a business from nothing (starting a YouTube/Insta/TikTok channel or a free blog). People just need to put their already-owned smartphone or laptop to good use.