There must be some kind of mistake, or some details getting left out here. Usually Salesforce (the parent company) is pretty nice about offering discounts to nonprofits. If they are losing the discount, could it be that maybe it's because the clients they serve (i.e. the people receiving help/services at their nonprofit) are treated as "active members" of their Slack instance?
I'm not too familiar with Slack pricing but it suggests in the Fair Billing policy[0] that they bill per active member. Without any discounts, the Pro pricing is $7.25 per active user per month, if paid annually.[1] If they are needing to pay $200,000 annually, then I think that means they have over 2,000 active members in their Slack which does not sound like a "small nonprofit" to me.
[0]: https://slack.com/help/articles/218915077-Slacks-Fair-Billin...
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