Haven't Teams and Slack eaten their market in the intervening time? Even Discord and Matrix are moving into the space. If they're still profitable, it's because they're extracting more money from a shrinking pool of customers. I guess Oracle has shown that can last a while with many of their products, but I'm not sure that's the kind of influence they once had.
Slack and Teams aren't in the same category as Basecamp which is more of a ClickUp, Asana or Monday competitor, ie a project management tool.
Oh I mixed it up with Hipchat for some reason. Turns out Hipchat's not even the same company.
Additionally, I'd wager a good majority of their paying customers had no idea the controversy was happening, or weren't going to change their entire office operating procedures because the owners may have some caustic opinions.
Yes, that's the other thing. (Corporate) customers almost universally do not care about internal company drama unless it materially affects them (such as with the recent Hashicorp license changes). Even end consumers don't much care, otherwise Nestlé would not continue to be as successful as it is. There is only so much energy that people can expend daily to care about something, and usually other people's drama is not it.