How do they add you to their blacklist?
The use of black lists to prevent low quality submissions in academia is pretty rare. I have never heard of a journal or conference having a formal black list procedure. The first I ever heard of a formal black list system was the one implemented by EPSRC in 2010. There was a discussion of the system published in Nature soon after it was implemented. Basically, the system works as follows, if a PI had 3 proposals that were either not scored or scored in the bottom 50% in the last 2 years, they are only allowed to submit one application as a PI for a 12 month period. Grants submitted where you are a CI do not count against you and even when black listed you can be listed on an unlimited number of applications as a CI.

The fact that formal black lists are not frequently used, does not mean that submitting low quality work does not hurt your reputation. It is quite likely that if reviewers frequently see low quality work from a researcher that they will have a negative bias towards future work from that person/group. The opposite holds for individuals who consistently produce high quality work and sometimes get the benefit of the doubt. In fact, I think these biases are one of the reasons for a double blind review system.