Among other things, Rubin learned that former Twitter staff planted “secret” code in the algorithm to “shadowban” conservatives before leaving the company.

https://slaynews.com/news/elon-musk-gives-alarming-update-on-twitter-a-flaming-dumpster-rolling-down-the-street-entire-code-may-have-be-torn-down-and-start-from-scratch/