Yes, I see that they use fire base as their server and that’s quite an easy database that can be manipulated, unless they use cloud code with it which is entirely possible.
If they use their own custom cloud code, it might be possible to manipulate the outbound messages and increase the amount of item created / received when crafting stuff or doing other things.
I think the best bet is to try manipulating the outbound client messages to the server as they likely have a server user with your amount of items, and to increase the amount of items it probably needs to come as a request from the client, which then might be validated in the server cloud code.
hehe, notice that I am a programmer who’s been working with servers and mobile games? 🤣