Unity update #4(?): Well... they said the new "Industry" license applies retro-actively even to Unity 2021. It doesn't matter that our income is below the limit since we are working with organizations (that don't pay us yet) whose income counts against ours. Paid them just shy of $20k (per year) because otherwise they were going to cancel our (already quite expensive) Pro licenses.
LITERALLY the same day we get an email saying they will be hiking the license cost to over $6k/year in 2025. -_-