The bigger relative risk is precisely why the billionaire is so rich - their surplus wealth may be wagered against longer odds when it would be suicidally reckless to yolo your life's savings into a start-up. Those sorts of bets are the Venture Capital strategy.
The relative value of money being lower is what enables riskier investments and essentially what 'justifies' inequality in a bloodless utilitarian sort of way. You know how in economics trades may be net positives due to different valuations between individuals? The same applies in current certain money vs future risky unbound returns. That taking such bets is consistently a successful strategy breeds inequity even without any winner-takes-all effects or high barriers to entry.
Hypothetically if the VCs kept on 'gambling' on failed start-ups and always losing without any offsetting huge wins, not quitting because they think a win is just around the corner, it would be a trend that reduces inequity. As it puts money into the pockets of employees and smaller suppliers of neccessary capital production goods.
I am afraid you would find it harder to get larger groups of people to agree to the high growth potential, high risk enterprises because they tend to lack the spare capital to be able to afford to risk it. I think ironically the most probable tolerable risk profile for larger groups (who are presumably more precarious) is something big and secure being sold out of by larger players. (Small traders panic buying and selling and doing worse is its own separate problem.)
One form of company structure that technically does paying labor well better are partnetships typically used by law firms. It works for them because they have no real capital requirements and have high per hour productivity and labor expenses as the lion’s share of profits go to the lawyers whose names are in the company name.