In essence, don't most beginning writers write fan fic? Some are copying Poe, some Hemingway, some Shirley Jackson or Le Guin or Lovecraft or Conan Doyle or Austen or ...
Part of how you find your own voice comes from imitating the voices you admire. In some cases that includes plucking a plot or snatching a story-line as well. The big difference now from when I was young, the Internet means any number of people can see it. As Toby indicates, that could make some writers deeply uncomfortable if not outright angry.