Zork 1/2/3 are officially and legally released under the MIT license

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From your blog:

The Zork 1 repo contains Zork 1 release 119, serial 880429. (See the zork1.chart file in that repo, or the runnable game file in COMPILED/zork1.z3.) This is not a version that Infocom ever sold, as far as I know. All the Zork collections available since 1990 have contained release 88, serial 840726. So this is not the exact version of Zork that you played way back when.

At least according to the commit messages, revision 88 is there, you just have to go back in the history a bit. Commit 34cc828c4f has the log message “Revision 88 (Original Source)”:

This is the diff between r88 and r119:

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