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Slack does this via their Fair Billing Policy [0] and it’s completely automatic. You only pay for active users, so those who go inactive are free.

[0] https://get.slack.help/hc/en-us/articles/218915077-Fair-Bill...

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I love this about Slack. It puts me into a different mindset. I'm less defensive and therefore more creative, productive, and happy. Most other services put me on a constant lookout. How are they going to "get me"?

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