the other day I learned you can download Wikipedia and it’s something like 50 GB of text plus 50 GB of pictures
Nah, it’s 22 GB for just the current English version, text-only Wikipedia. Adding the media English current version only would be 140 GB (plus the 22 GB for the text). https://en.wikipedia.org/wiki/Special:MediaStatistics https://en.wikipedia.org/wiki/Wikipedia:Size_of_Wikipedia
So you could do text-only Wikipedia and probably compress it. Maybe drop a few thousand of the articles that don’t matter or are stubs. Drop all the entertainment articles, etc.