Please re-read then try again.
Your mum jokes are irrelevant given the fact their post history proves all 3 are pumping the same shit icos over and over.
You are missing the point entirely.
They are not spamming sharding. They are using any discussion they can think of to join together to collude and spam the same ico's
Regardless, you always have the option to report to moderator and their posts would likely be deleted or thrashed.
Or if you feel any stricter penalty is needed you can make a post on meta just as you did.
Joining the spam on the thread is not one of the ways to handle the situation.