Oh I found a way to annoy & neutralize spammers. I made a lvl 1 on Llane for census purposes and saw a new toon just at the spawn point. I /traded with him and it said that trial accounts cannot trade. So, within 30 seconds he invited me into a group. He said want to get to 70 quickly? ... ugh... advertisers.
I dropped group... THEN INVITED HIM TO A GROUP. They have to accept/decline, but they just leave it there... for a whole minute. As soon as it 'declined' (due to innactivity) i invited him again.
He logged off after about 20 min then another one came on. I kept an eye on the "group leader" indicator and saw that on average they spammed people 1 per 15 seconds, so for 20 min i did this, and saved at least 80 people from the annoyance. Fight one for your fellow players while getting your censuses.
Maybe I can make a [ focus ] and /invite [ target ] macro... interesting. /invite %t didn't work and plain ol /invite didn't work either.