The costs of hardware and tools? Really? That's the least of your worries in a project like this. I'd be more concerned about, you know, actually delivering a working product.
The availability of end-users is a tricky one. If you can't get feedback from the people who will actually be using the product, how can you be sure you're building the right thing?
Unknown input quality due to third-party development sounds like a major concern. You never know what kind of data you're going to get from external sources.
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