Slack has raised our charges by $195k per year

I really wish this post had more details.

How was the price computed? If Slack charging per user, how did this organization have so many users? Why is their new provider more favorable in pricing?

If Slack was previously offering a nonprofit discount, what happened to it? Did they decide that this organization was ineligible, or are they shutting it down in general?

Are there details that would make it suddenly math for you? Getting a $50k bill out of the blue with one week to pay is an organizational failure / bully negotiating tactic.

What I'm trying to say is that a story with more details is more interesting to me than a story with fewer ones.

They spent multiple paragraphs complaining about Slack, and gave Mattermost a brief mention in a single sentence. I'd enjoy hearing praise about Mattermost if they're willing to provide it as well.