That's not true. They absolutely did not. Not soon enough. Slack launched in August 2013. Stride was release in September 2017. But then it was way, way too

That's not true. They absolutely did not. Not soon enough. Slack launched in August 2013. Stride was release in September 2017. But then it was way, way too late. 4 years is an eternity. Even Microsoft Teams had come out before Stride (in early 2017). Slack would go public less than 2 years after Hipchat/Teams launched with $400mm in revenue (FY2019). To give you a sense of Slack's scale and some perspective, the same year Slack went public - Atlassian did $1.2B in revenue.