What people are saying
Nobody has said anything yet.
The argument cannot be settled by saying workers agreed to the wage or owners deserve profit. First we have to decide what exploitation means.

"Capitalism is exploitation" is the kind of sentence that can start a three-hour argument while leaving everybody's definitions untouched.
During Sophisticated Unshitification, ElleJanelle tried something more difficult.
Instead of asking whether the slogan felt true, she started pulling it apart.
What exactly is being exploited?
Is profit itself evidence of exploitation?
If a worker voluntarily accepts a wage, can the arrangement still be exploitative?
Who created the value?
What did ownership contribute?
What alternatives did the worker have?
If the claim is that capitalism exploits labor, the word exploitation has to do more work than simply mean "somebody made a profit."
Brand New Thoughts
Karl Marx's theory of exploitation is not simply "bosses are greedy."
In Marx's account, workers sell their labor power for a wage. Over the working day, their labor produces value beyond the value represented by the wage. That excess, surplus value, is appropriated by the owner of capital.
The Stanford Encyclopedia of Philosophy's entry on exploitation summarizes Marx's position as the view that workers are exploited when they sell labor power to capitalists for less than the full value of what their labor produces.
That theory makes exploitation a feature of the ownership relation, not merely a case of an unusually cruel employer.
A perfectly polite capitalist could still participate in exploitation in the Marxian sense.
A neoclassical labor economist does not generally begin from surplus value.
The questions are more likely to involve productivity, labor supply, labor demand, human capital, bargaining, market concentration and the marginal contribution of different inputs.
From that perspective, profit is not automatically proof that workers were cheated. Capital, risk, intellectual property, organization and entrepreneurship can contribute to production too.
This is why arguments across economic traditions often miss each other.
They are not merely reaching different answers.
They are modeling the transaction differently.
The strongest objection to the exploitation claim is simple:
The worker agreed to the wage.
But agreement alone cannot settle every moral question about an exchange.
The philosophical literature on exploitation contains theories that explicitly distinguish voluntariness from fairness. The Stanford Encyclopedia's overview surveys several competing accounts.
Consider a worker choosing between:
The worker still chooses.
But the quality of the alternatives affects bargaining power.
That does not prove exploitation. It does mean "they agreed" is not a complete description of the conditions under which they agreed.
One way to make the argument less ideological is to look at distribution over time.
How much of economic output goes to labor?
How much goes to capital?
How have wages moved relative to productivity?
The International Labour Organization has documented periods in high-income economies when productivity growth outpaced real wage growth and has tracked changes in the labor share of income. The ILO's wage research provides the data rather than a slogan.
Those facts still do not settle Marx's theory.
They tell us where the argument should look.
If workers become more productive while compensation fails to keep pace, who receives the difference and why?
That is a measurable question.
Suppose two workers create identical output.
One works in a city with five competing employers.
The other works in a town dominated by one company.
Even if their productivity is the same, their bargaining positions may not be.
Modern labor economics studies labor market concentration for exactly this reason. Fewer employers can mean workers have less ability to leave for a better offer.
That makes exploitation partly institutional.
Who owns productive assets?
Who can wait longer during a negotiation?
Who has savings?
Who controls information?
Who can credibly walk away?
"Is capitalism inherently exploitative?" may contain several questions hidden inside one sentence.
Marxian question: Does private ownership of productive capital structurally allow owners to appropriate surplus produced by labor?
Market question: Are wages generated by sufficiently competitive labor markets?
Moral question: When does an unequal bargain become unfair enough to count as exploitation?
Empirical question: Who receives the gains when productivity, profits and output rise?
Those questions can produce different answers.
That is not a reason to abandon the argument.
It is the reason to make it more precise.
Is exploitation mainly about low wages, unequal bargaining power, ownership of surplus, lack of alternatives, or something else?
Nobody has said anything yet.