You cannot leave individual channels of a Team though you can mute them and you have even less permissions than Discord.
So maybe it isn't a 1:1 replacement for Slack but it certainly could compete in the field.
EDIT: Another example of discord's permission system being a poor match for the business use case is pinning messages to the channel is the same permission as deleting other user's messages. Additionally, the channel per server limit is 500.
It's like they took IRC, saw it worked for businesses, and were like "how can we fuck this up, slowly, to destroy the very essence of what made chat channels useful in the first place?".
https://help.twitch.tv/s/article/Ending-Support-for-Voice-Ch...
Curse Voice released in June 2015. Discord released in May 2015.
At best you could fudge the numbers and claim that Discord and Curse came out at the same time. A claim that Curse Voice was anything before Discord existed is flat out false.
[1] https://www.player.one/curse-voice-vc-funded-skype-gamers-be...
[2] https://venturebeat.com/2014/06/17/curse-gets-a-million-game...
"Ok, you know our motto, 'Don't be Evil.'?"
Heads nod.
"What if ... what if ... what if we simplify that?"
"How so?"
"Just cut off the first word, 'Be Evil.' Simple, elegant."
"I like it!"
----
Jokes aside, I think Google does a pretty good job of keeping the major products steady. Our little cohort on HN isn't a great sample for determining what "major" is.
They've killed off a lot of buds, but they've also killed some great products.
They still haven’t fully closed on their Fitbit acquisition, so I’d expect they’d have a tough hill to climb for a Discord or a Slack.
Relevant XKCD: https://xkcd.com/927/