That is incorrect, it may be what your kindergarten teacher taught you was the nice thing to do, but it doesn't make it the definition of the word.

share /SHer/ verb 1.have a portion of (something) with another or others. "he shared the pie with her"

synonyms:split, divide, go halves in/with;

edit: seems like a lot of people have the same misconception that sharing implies free of charge, here is a link to the definition for those who are unfamiliar: https://www.merriam-webster.com/dictionary/share