Is Slack a Customer of Sales Cloud?

Slack's integration with Sales Cloud is so good that the way I go to look up stuff like this is to look at Slack rather than in Sales Cloud. IBM has 350,000 people using Slack and something like 10,000 custom integrations. Microsoft Teams isn't an alternative to Slack; it's not really what we think of as big competitors. And then make it teams that develop software much more powerful.