Earlier quoted context omitted.
>I've known some brilliant engineers who don't care at all for open source code The obvious irony here is those "brilliant" engineers will use open source code even though they don't care for it.
So? Just because your code is not open source does not mean you're not allowed to use it. They might not care about the company they are applying to opensourcing their code. Plus you have to try really hard nowadays to not use any open source code at all
Depends on the license of the OSS and wether you're distributing or hosting the code that relies on it.