The fact that they don’t, while having the freedom to do so, indicates that the typical arrangement of wage labor is consensual.
It's actually that most people simply don't have the capital to do so while entrenched capitalist interests do. But I guess maybe you're conveniently ignoring that wildly imbalanced scale to be able to say it's consenual. Most people are only born with their labor to sell while the capitalist class hands off their wealth to their progeny, who can live without labor, and thus do things like start a business without fear of failure. More than half of new businesses fail within 10 years. For someone without oodles of capital to fall back on, that kind of failure can be financially devastating, which makes them less likely to choose to run their own business, because the risk is far higher. The risk to the nepo-baby is negligible, because they have capital to fall back on, so they are more likely to start their own business. This is obviously an unbalanced situation so calling it "consensual" is frankly bullshit. Also it ignores the coercive nature of the risk of homelessness if your business fails badly, once again something the capital-having nepo-baby doesn't have to fear or risk.
Like, it's generally considered at this point that Monica Lewinsky didn't have consensual sex with Bill Clinton simply because the power relations were wildly off. He was the President of the United States of America at it's absolute zenith in history, while she was a random 20-something intern with no connections or power in the situation.
Nice try, tho.