You were added for general low quality posts. You do not have to be accepted into a campaign I manage to join this list, however at the moment I am only adding those who apply to campaigns I manage.
Often in the past, I would get 40+ applicants after just going to sleep and waking up. Usually a fourth of those are people with very poor post quality who I'd never accept, and it would just be a waste of my time. Hence, I created a blacklist, and I am now publicizing it for transparency and in case another manager wants to use my list.
One line posts are not always bad. Often, one line is all that is needed to answer a question, provide the needed support, etc. If you feel that those one line posts are actually spam, feel free to send me a PM and if I agree I'll remove that person and send you a tip.
I would think that if my campaign was not run correctly, I would not have the support of the company, and I would definitely not have a long line up of people wanting to join. I'm sure the Reputation section would love to hear about my errors in campaign managing though, so I strongly encourage you to make a thread there. All campaigns are run on personal feelings, as there is no definite way to determine if a post is spam. You could argue that long posts are good, but I can easily make a 1000+ character post repeating the exact same point over and over, except reworded, or by going to a spam megathread, reading what others have said and including all of those points into my own post. As far as I know, no manager other than me uses this list, so it does not affect your chances of joining other campaigns. I am willing to bet that if you applied for a SMAS campaign, you would also be blacklisted though. You know the Legolas campaign? This is the manager's opinion on spammers:
You can also request a review in a month, if you think you don't deserve to be on my list. However, look at your past posts, and you will see that your complaint post is 400%+ longer than your other posts.