What is the ruling on using articles deleted from the internet and placing them on an e-marketing website to increase content, without knowing the original owner?

If obtaining the articles is explicitly or implicitly authorized by their owners, then there is no harm in placing them on the website, provided they are not attributed to anyone other than their original authors. However, if obtaining them is not authorized, then it is not permissible, as it infringes upon the rights of their owners.