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$6.67/month is less than $0.33/day (~20 workdays/month)!

That's an trivial amount to pay for effective communications in my book.

$0.00/forever is also trivial, with so many OSS alternatives out there.

How much time do you have to spend setting it up, maintaining it, documenting your set up, etc? While OSS has no upfront costs, it does cost in terms of dev and admin time.

You pay that for every Slack user, no matter how many or few messages you exchange with them. I don't think someone else is going to pay $6.67 to replace ten email messages.

"I frequently interact with at least 25 people just to do my job"

Frequently, not ten messages in total.

Email works fine for non important sporadic communication.

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