We have considered possible changes carefully, but we won't be changing our
default license or React's license at this time. We recognize that we may lose
some React community members because of this decision. We are sorry for that,
but we need to balance our desire to participate in open source with our desire
to protect ourselves from costly litigation.
Given that they apparently didn't think it was a big enough deal then, and what changed was Wordpress, I don't think it's incorrect to give them some credit.[0] - https://code.facebook.com/posts/112130496157735/explaining-r...