Apparently licensing of the Gentoo repository was changed from GPL-2+ to GPL-2 (only) in 2002, see for example [1] and [2]. I cannot find any announcement or discussion about this.
Who was around in 2002 and still remembers what was the rationale? Ulrich [1] https://gitweb.gentoo.org/repo/gentoo/historical.git/commit/skel.ebuild?id=e67af11c176e4dca33846e65c2649aa456de3099 [2] https://gitweb.gentoo.org/repo/gentoo/historical.git/commit/header.txt?id=dc4dfe8aa903fb467e648da80f8bc3178411a77a
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