At one point I saw accounts with 5+ reported plagiarized posts still hanging around so I just gave up on it.
From my experience,
my plagiarism topic isn't often checked by Mods to ban them. But if I report a plagiarising post directly, they're banned much quicker.
All accounts that I inform the moderators in your topic are always processed, and users are banned. But for this, I also send the report directly, with a link to the post.
But lately, some posts with obvious plagiarism have remained unprocessed. Although, if you compare all my reports to the accounts that I described above, they were banned instantly.
The moderators probably have a lot of work to do.