only individuals (authors) can post on the platform?
Not always. Producer that produces content can be a specific press company.
and who makes a profit in this case?
Generally, an article produced by a reporter who work for a press company is owned by the press company according to the copyright law.
but the author has other ways to profit, right?
You are right. Although the reporter belongs to the press company, he can obtain a reputation and can receive rewards based on the activities other than producing an article.
So, he can delegate some of his rights through a smart contract with the press company?