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Re:Please don't use Slack for FOSS projects by wstrange on Monday February 01, 2016 @01:17PM (#11013840)
Practically speaking, Slack does not do this either.

Most open source projects can not pay for the archiving feature - so messages are deleted and gone forever.

Re:Please don't use Slack for FOSS projects by s_kilk on Monday February 01, 2016 @01:51PM (#11014232)
Yup, we're facing this problem right now in the Clojurians group, where there's usually less than 24 hours worth of history before it disappears.
Re:Please don't use Slack for FOSS projects by solipsism on Monday February 01, 2016 @02:27PM (#11014631)
so messages are deleted and gone forever

They aren't deleted and gone forever. They're simply not searchable. If at some future point you decide to pay, your entire history is made available to you.

I realize that doesn't help projects who will never want or be able to pay, but it's an important point for those who might.