While that is true, there is a reason why most celebrities rarely sue tabloids, it's simply not worth it. Tabloids has been writing lies for YEARS and those celebrities know that even if they won a lawsuit, it wouldn't stop the tabloids to write another lie.
Harry should take a page from Jennifer Aniston's book, if the tabloids are to be believed, Jennifer has been pregnant for 3523 times now, and she simply ignored those ridiculous stories.
Or take an example from the Queen, how many stories have the tabloids wrote about the Queen is dying, and how she would make William & Kate the next King and Queen to spite Charles & Camilla? Yet the royal family never sue the tabloids for those stories either.
Harry should read the expression "Never pick a fight with people who buy ink by the barrel."