Lots of "shareholders" are people's retirement funds, pensions, and the like. When those funds finally pay out, they get taxed as income just like for everybody else.
Saying that Uncle Scrooge and his buddies own all the stocks is not much worse than implying that normal people own a significant share of the market through their retirement accounts.
Each of the 90 people invest $5k and have 1000 stoks.
Each of the 9 people invest $20k and have 4000 stoks.
The millionaire invests $100k and has 20,000 stoks.
The top 10% have 99.96% of the stoks.
It would be weird if the richest people didn't own most of the stocks. It doesn't necessarily mean there's a problem.
The underlying issue seems to be whether it is ethical for a business owner to make money.
Payroll, benefits, offices, etc are easily >50% of revenue in virtually all ventures (including diamond trade and definitely your favourite tech unicorn)
Also implicit in this statement I think, is the assumption that shareholders don't provide as much value to the business, or perhaps the economy writ large. Arguably the investors at least initially play a more crucial role than any employee no mater how back-breaking their work because without starting capital most businesses don't even get started in the first place. But in general all aspects of the business contribute to success, Shareholders, employees, and executive. I don't think moralizing one class over another is useful to this sort of conversation.