Data mining is an old gamedev worry. Nobody who's been doing it for a while particularly cares. If the game is remotely popular, data mining will happen. Disassembly to find the decrypt function is a talent possessed by many, many people who have the reverse-engineering bug. If you then obfuscate the code, you have made things interesting and then increasingly talented people will try to have a go at it. If you combine a changing obfuscating technique with updates, you can slow down community possession of the game with respect to modding etc., and Minecraft worked that way in its beta phases. But it's really all a question of your purpose at that point.

If you haven't already, I suggest cruising through TCRF: https://tcrf.net/The_Cutting_Room_Floor

You do realize, exposing the "inner workings of the game" seems to be at least somewhat responsible for massively increasing the appeal of the game in other cases? see Minecraft, Rimworld, KSP as a few examples...