Yeah the long forgotten Steam release of League of Legends is also in the files (it was only available for like 5 months)

Might not be the most interesting game in the leak but old versions of live service games are almost impossible to come by

https://steamdb.info/app/20590/

Downloaded it to extract all the old assets but it still needs an encrypted depot key

>error!! -- extract: missing depot key!, pass --key if you know it though

Some people reported that "--key 0000000000000000" or "--key 0" works on some depots... well not here