He is probably talking about the recent thread that got deleted because of the extreme spam that was coming from the campaign.
Joining a signature campaign and making constructive posts in the whole forum it's ok. Paying users to do insubstantial posts in their threads is already against rules, but it was even worse considering that the campaign from Decentraland was allowing users to do 10 posts per day in the same thread.
Here is theymos answer:
That is very much
not allowed. The threads are trashed, the poster is banned for 60 days, everyone who participated is banned for 3 days, and everyone who participated cannot display a signature for 30 days.