To add on to this list, even IBM with their large patent portfolio has a large number of teams deploying projects using React and other FB OSS technology.
Disclaimer: I work for IBM.
Disclaimer: I work for IBM.
Source: Friends at IBM
However, many teams went through the process in order to use it because of how valuable they believe React is to their products. Groups like IBM Watson IoT were fortunate enough to get portfolio-level clearances as well during that time.
Thankfully the process changed and many product teams add React to their list of libraries/frameworks to evaluate for their use-cases.
To be concrete, IBM Watson has several products that leverage it that we sell to customers. For example, Watson Company Profiler, Watson Virtual Agent, Watson Discovery-related tools, and more.
Other organizations use it as well inside of IBM, like IBM Cloud and IBM Watson IoT, but I'm less familiar with their products off the top of my head.