You're getting downvoted because your answer was bad. Slack isn't "not exactly like discord", slack is not even remotely close to a replacement for discord unless you are only considering text based lobbies. Slack is built around enterprise IM as a paid service, discord is built around gaming voice chat as a free service.

If someone says that they want to replace their Tesla and you offer a golf cart to them while saying, "they're both electric, so same difference", don't be surprised by others finding that unhelpful.