Earlier quoted context omitted.
This isn't exactly the first time Facebook has been called out for poor engineering practices: https://www.darkcoding.net/software/facebooks-code-quality-p... https://blog.timac.org/2017/0410-analysis-of-the-facebook-ap...
So what? They're an enormous engineering company with many millions of lines of code. Bugs are expected.
Granted, perhaps things have gotten better in the last five years.
It's certainly possible for an enormous engineering company to have poor code quality or poor engineering practices, despite having a high interviewing standard. And a criticism of Facebook need not be a criticism of all companies that interview by Leetcode, for instance no one here is criticizing Google, Amazon, or Apple, and all have better reputations for code quality.
[0] https://www.reddit.com/r/iOSProgramming/comments/6upeu6/how_...
[1] https://www.facebook.com/notes/facebook-engineering/under-th...