Except, it can have a huge impact. I know of former artists who were very negatively affected by having their work stolen. One stopped posting their art online entirely thanks to it. So it can negatively affect the process of creating and sharing one’s art.
It's only a problem if you let it be a problem. It's all about how you let other people affect you. Don't let other people dictate your happiness and enjoyment. Own yourself, or else you're letting them steal more than just your art. ^.^