Posting with permission from TheMightyMcB.
User FromTheeRaven (account age 1 day, site membership 20 hours) recently posted 3 low-quality articles within the span of 8 hours (records of which are available to staff), all of which were self-deleted after being negatively rated.
The same day (@ 16:21 EST), user posted a sandbox draft to the Drafts Critique forum which had not been previously greenlit, which Naveil staffposted on. Four hours later (@ 20:39 EST), user made a forum post to the Ideas Critique forum, which initially only linked to their sandbox.
Riemann staffposted due to being against the forum guidelines, after which user updated their post accordingly.
EDIT: Also noting that in a prior discussion thread to one of their own articles, user asked for help on how to improve their article. After they were told on how to properly receive feedback (including being linked the Ideas forum's guidelines), user proceeded to post to the Ideas Critique forum against the forum guidelines. Screenshots of discussion thread are available to staff.