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This is of course not including the yearly Unity subscription, where Unity Pro costs $2,040 per seat (although they may have Enterprise pricing)
Absolutely ridiculous. Many Unity devs are saying they're switching engines on social media.
Did they clear it with the owners first?
Because if you don't, and later they pursue the legal route, there's not much you can do, you agree to their terms or fight a lawsuit where they'll likely take everything