Contemplating the possible retirement of Apache OpenOffice

My comment is slightly unclear perhaps. What I meant is that if they wanted that /modifications/ be contributed back under their licence, while still permitting proprietary closed source, then they should have used some kind of "source code distribution of derived works must be under this permissive licence" type licence.

I.e., if they had wanted other open-source projects' modifications to be under their preferred licence, they should have used a licence that achieves that - assuming that "source code distribution" is a workable bright-line between the "open source project" they want to require code give backs from, and "proprietary, closed use" that they want to permit.

To paraphrase Rob Weird, title and licence is all that matters and don't complain if that doesn't suit you.