Companies will usually take a hybrid approach when producing open source software. Open Source projects eventually outgrow a single repository and will benefit from having a dedicated Organization.
Many applications start by consuming open source software before finding it necessary to contribute back to the projects they depend on. Additionally, for a variety of reasons, teams often decide to launch new open source projects. GitHub provides guides that helps individuals, communities, and companies embrace open source software : https://opensource.guide/
These documents provide guidance on topics ranging from how to start a new project and build communities to an overview of best practices covering legal and maintainer responsibilities. This information can be used to help your company define policies and processes that encourage open source contributions while protecting your intellectual property and encouraging participation.