Thats why the quote is right, "rich get richer, the poor get poorer" because they don't have capital to invest, start a business, etc.
you are right that first we need to earn enough money that will give us big returns on investment, or enough money to start a small business which have high chances to grow and future.
some lucky people are able to get high returns or gain financial freedom because there are very less opportunity like bitcoin in early stage, people who invested early were lucky to gain high returns.
Riches get richer because they have a constant flux of income dropping on their pockets every month, which is pretty enough to cover their expenses (which are already high) and to invest the surplus, at same time. Meanwhile, the miserables have only income to cover their basic expenses, being very attentive to make sure that money is going to last till the end of the month, and nothing else as surplus to invest or make plans for the future.
The tools each category of citizen have are different and determining for the future of each of them. While riches have powerful, automatic and technological tools under their disposal, the poors have only archaic tools from the ancient times. Of course, the results each of them will achieve are completely different after all, with very few exceptions.
What happens is that the media tries to sell these few exceptions as the rule, deceiving the masses to believe they will also achieve the same success if they follow a series of steps introduced by virtual coaches and economists. It has been a profitable business to lure and deceive people into believing easy and overnight wealthy. The truth they hide is that there are many other factors involved on the process.