I've been trying to tell everyone licensing is more important than they realize, but there are so many people who fundamentally misunderstand licensing and therefor just don't care (dwtfyw license for example), or have falsely been trained by subpar instructors at uni and $othertraining about how bsd/mit is the superior license for business because $reasons.
The four freedoms and free software solve so many of the problems I see around modern tech-infrastructure. No, free software doesn't solve every issue and has some of it's own, for example I think at the code complexity levels we are at the many eyes theory is starting to crumble, but it doesn't change the core truisms about freedom in computing that are important for us to move forward in a free and open society if we actually want to start solving prolems.
Now that we have a concrete example of how picking tooling with bad licensing can bite people in the butt, please take this time to at least consider GPL varients (A/L/GPLv3) for as much of your tooling as you possibly can. (perhaps CC0/CCBY/CCBYSA for content)
In my opinion, MIT/BSD licenses like FB moved to in this case simply aren't good enough to be future-proof, primarily because of the ability of future tivoization of a product that removes freedom from the user (think BSD on playstation).
Remember, either the user controls the program, or the program controls the user.
If the GPL scares you for some reason or you have question about it (commercial sales of gpl software for example), feel free to ask. I've spent enough time wading through just about every license so I think I might be able to cut through some fud.