First I want to say good job for your findings and I'm not against your initiative, but I'd like to ask a couple of question since I'm not completely understand about it.

1. Which part if those spammer can be said as alt farm? AFAIK they're giving any merit to each other which is their effort are completely pointless. I'd say he's just want to trolling in this forum and didn't do anything related with money or abusing an event.

2. Based on my research, those accounts already got banned. Why does moderators ban those accounts? it's temporary or permanent? AFAIK most accounts got banned due to plagiarism or evading ban, not spamming.