As you all said, it look like ronaldo40 is not banned from displaying a signature on the reason of promoting a scam site but because of a case of plagiarism. Thank you all for your clarification.
This forum has (and many agree with it) too much freedom when it comes to scam, and that’s something I don’t think is too much logical. If the rules of the forum were transferred to the real world, then people who cheated on someone would not be punished or imprisoned at all, but would only be labeled as thieves and fraudsters that everyone should watch out for.
Of course, I think the rule that apply in this forum are not relevant enough to be used in the real world, especially regarding scam case.
By such logic, the forum becomes an ideal place for various illegal activities, and the biggest punishment is a flag or a negative trust that does not bother them too much to continue doing their dirty work. Anyone who knowingly participates in a scam project should be punished at least with a signature ban, and that service should be banned from the forum - everything else is completely wrong and sends the wrong message to all who are on the forum and who are yet to become members.
I'm sure most forum users would probably agree with this kind of precaution, which means banning the display of signature and avatars for those trying to promote scam site. But in the end we all realized that forum don't moderate scam. This allows users to keep getting scammed and more victim if ignored. Negative tag and flag will not cause the user to remove the signature and avatar from the scam site. I firmly believe that account used in such campaign simply want to be paid without consideration to prevent scam on this forum. This means the account support scammer to get more victim.