Apache banned RocksDB and React.js because of the novel license Facebook used for them. Regardless of the actual terms of the license and patent grant, Facebook messed up by inventing a novel legal instrument they thought solved everyone's problems. Facebook’s rookie mistake of inventing its own open source license is always a bad idea. There are a range of important considerations that are not about the immediate risks or the specific instance. Their license action hits pretty much all of them!
Read more about this at:
https://meshedinsights.com/2017/07/27/5-reasons-facebooks-react-license-was-a-mistake/