Definitely someone can become rich without owning a business, you can just be a share holder in one this big companies, just fund your money to the company for them to use it to run there business doing this process your money is the one working for you not you working for your money you just seat back I wait for your returns.
first you must have enough money to buy shares of a company, then you will become a share holder in the big company,
if you are capable to buy a big company share then you are already rich because you can not buy a big company share with small fund.
without fund you can not make money in this way.