Big reasons for NOT using Slack:
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it's closed to Google searching, so if we moved to Slack, suddenly our visibility as a project and our community activity would disappear from the public eye, something equivalent to cutting our own throat
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the searchability WITHIN Slack for past messages is severely limited after 10,000 messages, because we are non-paying
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to have searchability WITHIN Slack (again, no Google visibility), we would have to pay a lot of money (it's per user per month) or we would have to request Slack's non-profit plan, which again limits the number of users to the low hundreds
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as @cdw9 points out, at least one other large open source community is trying hard to GET OFF SLACK for related reasons
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Slack's invitation model is the opposite of our open community's model of just letting someone jump in and participate... with Slack you need to know someone who can send you an invitation
So while I use Slack for my work with Wildcard and for small project teams, I think we should definitely not use Slack as a community.