Somebody at Twitter 1.0 left a poison pill algorithm hidden in the code to keep certain people shadow banned after they left or were fired.
(media.greatawakening.win)
🕊️ TWITTER CRIME SCENE 🕊️
Honestly, from what you see in a lot of coding focused industries, that seems to be depressingly normal.
After all, games like World of Warcraft, Final Fantasy 14 among quite a few others are referred to as "spaghetti code" because it's "not worth the money to go back and update old code", and this ends up being justified by a lot of people defending them because coding is a skill and takes time -- like every other skill, of course.
The thing it guarantees is that if the code is ever destroyed, there is no one who could recreate it.
In system engineering, we call this "losing control of the system definition." It is bad ju-ju and it certainly happens. I might say "it happens to the best of us," but the reality is that anyone who allows this to happen at all, does not deserve to be called "the best of us." It is just sloppy. Like Michaelangelo sculpting a "David" with six fingers on one hand.
It has unfortunate real-life implications, as 346 passengers and crew found out in regard to the 737 MAX MCAS software.