What do you think?
If it's plagiarism, it's up to the Mods to deal with. I don't even know if Global Mods can do that, or only Admins.
No. That is post plagiarism. Signature design plagiarism is theft that has been dealt with the trust system.
As for the parody:
an imitation of the style of a particular writer, artist, or genre with deliberate exaggeration for comic effect.
I guess I just don't see the comical value for
Vadi2323's signature on a Bitcoin forum where many users value their privacy.
Correct. This is why I think my previous opinion is wrong. That particular case is simple, but some other cases might be very difficult: e.g. something that may be funny to some but not to others. Easier if the consensus was just: Do not do it.