That would utterly annihilate its corporate use if there was even a rumor they randomly censored content like operations and QA/QC discussion. My company also pays extra money to slack for the "we log everything for your e-discovery enjoyment" so there would be substantial legal issues if they randomly started hiding stuff we're paying to be e-discovered. Slack has problems, but weird censorship stuff isn't one of them.

Weird as it probably sounds, FB sucks for humans because its users are people not corporations.