1. Remove the signature of all forum users.
I find it interesting that you're even suggesting this given that you're running a signature campaign yourself. And what about your copper membership?
I'm sure you had a good reason to pay for it...
Clearly, we will reduce shit posts and spams, and Only users for bitcointalk will be left in this forum.
Yes, this would help reduce spam/shit posts but did you forget that a major point of this forum is to promote projects?
Do you think you should continue to use threads that encourage such fraud?
No, but you can report scams and frauds to the moderators and just ignore those threads until they're removed.