If anyone is wondering what other modules they refer to, or how to discover any on your own system, this StackExchange thread on how to identify out-of-tree modules might help.

If anything is missing with regards to open source within companies (of all sizes), it's this situation.

Teaching "companies" (or rather the entire management stack/chain) how to "effectively contribute and participate in upstream projects" could change the game for those companies, the projects they interface with, and certainly for the developers (inside and outside of the companies).