'cause free web host always place PHP as the only scripting engine, and they are sold lies by their peers. What you can do to help eliminate this, is to make a rebuttal of PHP, and provide free hosting, with a link to the rebuttal.
Recall, this is the same snake oil ENTERPRISES are sold with. Which is why we still have useless things as .NET, Transact-SQL, SAP ERP, Oracle RDBMS, cPanel, iOS SDK, Microsoft Windows, Mac OS, etc.