I've had an account for a while but don't really have any reason to use it.
Seems like they're pivoting towards being a Slack competitor. Maybe if they open sourced the server portion it could be a chat solution that OSS projects can feel okay about using.
I use it for personal communications too, so it is nice to use the same secure messaging platform for both work and personal and switch back and forth from computer to phone easily. I do wish the server portion and apps were opensource though.
I wonder now could it be used for corporate secret management. I wouldn't like to use cloud solution for that and on existing on premise solutions do not cover all scenarios I need (on-boarding one of them, or guests).