Unless you're buying hundreds of thousands of chips, you don't even get the "opportunity" to work with them. They won't sell you chips directly or return emails

Unless you're buying hundreds of thousands of chips, you don't even get the "opportunity" to work with them. They won't sell you chips directly or return emails reliably. If you're working at one of the big companies (e.g. Microsoft), they'll give you access to the documentation and source code that should be open for everyone, but even then you're going to spend time reverse engineering your own documentation because trying to get details from them is a months long process of no one being willing to say yes. It's painful. Best to stay away unless you have no other alternatives.