I think they are also harvesting data from the lodestone itself. i had removed /shout chat entirely a few days after launch cause it was so bad, a few days ago i turned it off. It has gotten a whole lot better than it was. I was in Ul Dah even and didnt see any spam for a whole 15 min, then there was a flood of the smae thing changing the las three random letters, then it was gone again.

These things take time. As frustrating as it is for players, SE has to deal with gill sellers AND players complaining. I know its difficult but try to be patient.