I believe that the claim is that the workers are exploited, because they produced value but received less than the value they produced. And that does sound like exploitation. But consider the alternative.

Let's say that every worker was paid for the full value that they produced. That would mean that the profit of every company was $0, because the workers got all the value produced. How many companies would we have? Probably not very many. Risk my capital to start a business, for a return of $0? Yeah, no. I'll pass. So will most people.

And that would mean that we wouldn't have the things that large businesses produce, from computers to airplanes to vaccines.

Even for the workers, is that a net win? I don't think so.