This rule should also probably be removed:
Requirements
3 posts per thread maximum (you can of course do more but they won't count towards the campaign)
It was probably made with good intentions but all it does is encourage/force users to post in threads they have no interest in.
I was a part of stake signature as well and for that reason, I have had been added to the telegram group.
No such rule was there at the beginning but later Steve added this rule for couple of weeks but recently the rule was changed, no limit is there.
The root cause of the spam is
1st Page Contest. User with the highest post in 1st page will win the contest. Guess how they jump into the new thread. I have had the chance (if I can recall correctly) to see almost all of the posts by stake campaign participants in the first page of a thread. This is the worst contest I guess. It directly encouraging spam.