Well, the artist him/herself may care. While it's indeed very difficult to protect any claims to copyright for images posted anywhere on the internet, here at CruxForums, we do encourage members to give credit to artists when they know their identity, and we don't approve of removing signatures. It's a matter of courtesy, and of course the artist may be a member here, perhaps under a different name.
@AndreewaOlushka so our policy here is that you should keep the signature as shown on the original, or at least mention it when you post the image. The signature is not the artist's 'real' name, but it's the identity they used when they made that picture.