He didn't mention the big reason for in-house: security Telling an outsider about your needs (revealing insider info, trade secrets, etc.) is risky. It's even

He didn't mention the big reason for in-house: security Telling an outsider about your needs (revealing insider info, trade secrets, etc.) is risky. It's even worse if the result will not be fully air-gap isolated from the Internet. That gives somebody a hole into your business.