The narrators purpose of robbing Anil? Was Anil the only one who was robbed or did Hari also rob himself of something?

Yes, Hari Singh was successful in robbing Anil. But Anil was not the only one who was robbed at that time. Hari had robbed himself as well. He had lost the chance of receiving education and being literate. He had robbed Anil monetarily but he had robbed himself of the chance for a better and brighter future, which was much more valuable.