The problem is that the anti–union sentiment of the Facebook employees leaks into the tools they build. Facebook may give six–figure salaries, but Facebook Workplace is used by e.g. Walmart, which has a median salary of $19,177 [0] and a notoriously bad track record of labor violations.

[0] https://www.wsj.com/articles/at-walmart-the-ceo-makes-1-188-...