You can upload Gerbers/ODB++ if you like. We also sign custom NDA's. We count many of the worlds largest corporations as customers so this is pretty standard.

I second the use of NDA/privacy gaurantee as default. It shouldn't be opt-in with friction. Of course if I want to use a custom/overriding NDA then i'm happy to contact you to review.

Would you address other concerns voiced above? They are pretty serious points or allegations. Also, a PCB sourcing should not require a custom NDA when the selling point is convenience, legal protection, and speed vis-a-vis overseas sourcing.

Then there's either a usability issue or a bug. I uploaded gerbers but it wouldn't let me continue unless I uploaded schematics and board files.

And why should I have to sign an NDA? You aren't giving me any confidential data, I am giving it to you.