they do block domains, at least from their organic search engine results. i accidentally got one of mine blocked when playing around with some random software

they do block domains, at least from their organic search engine results. i accidentally got one of mine blocked when playing around with some random software that produced a site that was somehow against their TOS. i didn't have it live long, but long enough for the spiders to grab and flag. still waiting on a reconsideration request. why not mahalo? who knows. if i had to venture a guess, i'd say that the larger the site and the more revenue google sees from that site due to adwords and the like, the higher up the chain the decision to block it has to come from.