

Also from the other end, because of how the filter works, mods using couldn’t see messages the user put, so they’d have been free to do whatever, until caught by either a bot, or moderators not using the frontend.
One of the reasons it was found to begin with was because the db-zer0 instance was on it, and the admin, who was using tesseract, suddenly couldn’t load any posts from the instance at all. As Tesseract presents it as a compatibility issue, they were trying to track down the fault at the time.
If opening inspect element and looking at a website’s served HTML is hacking…