> There are many more reasons one could imagine (Copyleft, domination by Linux distros, developer egos, ...) so everybody is free to make his own version of the truth here.
You do not have a 'money' reason in your list.
If I were IBM, I would like to have the option to eventually make money out of the office suite. The Apache license allows for a fully closed-source office suite. The MPL license (offered in LibreOffice) does not allow for a fully closed-source office suite.