He could at least change the colors, nobody would accuse him,.
Changing the color makes no difference. That's even worse than just changing the domain and do nothing else.
It's quite funny actually. I don't know how the admin or mods will see this. I guess they will just let it pass until the owner of the signature complains.
They shouldn't wait for that. Like what they do with plagiarism. They never wait for the original writer to complain.
I personally don't see the issue if someone alters a signature design for personal use. It becomes a different story if a campaign steals another campaign's design.
I don't agree with you. Campaigns usually pay for signature designs and they should be the only people use what they have paid for.
I think it's fine as long as he is only using it personally and isn't trying to sell it..
How to know if the design hasn't been bought from someone else?
(Talking generally, not about the case)
The user is using the design freely, while others pay for it or create it themselves.