For starters originalworks did stop posting for a while so there might have been something going on there. As for upvoting Spam comments that might be on a first come first serve basis or some other algorithm we don't know yet.

Now there is another aspect of SPAM COMMENT which is the fact that the person writing it might not have English as their Native language and thus might have trouble expressing themselves properly in English.

There are a lot of factors that need to be considered once you look into Spam Comments usually when I find such comment I go into their Blog and check all past Comments and see if they are actually Spamming or just having a tough time with language.