Not force exactly but coercion certainly.

Expressing the requirements you have of workers before you offer them salary is no more coercive than having requirements of flavor before you offer money for coffee. Starbucks is not forced to provide Pumpkin Spice if you are only willing to buy Pumpkin Spice. The only coercion I see is coming from people who aim to force organizations to pay for labor.

interning is for the benefit of a company

The article says that interns are often students. What is a student?

A student is a person who works in a structured environment, with a fixed schedule, for an extended period. A student receives no salary.

Do advocates of minimum wage condemn this arrangement? Of course not. Sensible people support financial aid, to make it easier for disadvantaged people who can't afford to work without salary to become students.

What are the benefits that a business receives from an intern? Answered phone calls, filed paperwork, cases researched, facts checked. All in support of the real goal: to make more money for the business.

When I said the student receives no salary, I left out a detail of the working arrangement. Students pay for the opportunity to work hard in school. The university benefits more immediately and directly than any business. Any other business, I should say.

There's nothing wrong with that.