Did you have a special deal with Slack? I don't understand how they can just increase the price with a few days notice?
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If they determined that Hacker Club violated some terms of the nonprofit demanding they move to regular or be kicked out seems not as bad
Although frankly this is a good lesson for a bunch of young hackers to learn.
If slack found out that the company isn't really a non-profit, or that it violated the requirements in the non-profit agreement (such as promoting discrimination) it would justify a demand for immediate payment in my opinion.