What did I misunderstand? Their documentation (https://docs.circuithub.com/importing-a-project/files-requir...) says:

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For additional legal protection of your intellectual property please sign our NDA.

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To make it worse, you can't even read what their NDA says without signing up with your email address on a third party site.

Yes. If you're that risk adverse that giving your email address in 2026 to a site is too much of a burden, you're going to be a problem customer and they don't want your business. They're in business to make money and it's a business transaction and if you can't cross that low threshold, you're more trouble than you're worth as a customer.

Isn't capitalism neat‽