Slack's business model would be negatively affected by user data mining. They operate on a "free for small hobbyist use, expensive for large corporate use". Corporations do not like when you mine their data and are generally able to do far more about it than average citizens. By default Slack's free plan doesn't even store more than the most recent ten thousand messages, so clearly they're not that interested in extracting targeted ad information from what free users have to say.
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