Today, open source software products dominate the market. Companies that used to be closed-source have been forced to release open-source projects and contribute to existing open projects. However, the open source movement has only progressed so far. Most open source communities only build products that are part of a larger product or service offered by large private companies who do not contribute much back to the community.
In this sense, most software development still operates on a centralized basis, even though it is open source. For example, many developers build open source software on Github. They send in their contributions, which are peer-reviewed, merged and released. For most projects, the Github account owner is responsible for the quality and direction of the project, while developers and users do not have much say in the matter. Only the account owner has the power to censor contributions and discussions, as well as limit access.