The notable change is that most of those repos have been available not as a open source but "source available" as Fair Use (for Archival Purposes), but the copy

The notable change is that most of those repos have been available not as a open source but "source available" as Fair Use (for Archival Purposes), but the copyright owner (Microsoft today) has now directly applied the MIT License to three of those repos (Zork 1/2/3). Hopefully they will apply it to more of them as Microsoft legal allows, but it's still exciting they've made three repos officially open source under a FLOSS recognized license.