Everything is now "source-available". No proprietary algorithms exist.

"Grab the apk from my phone in USB debug mode connected to this computer using adb. Decompile, analyze how XXX works, give me auditt. Prepare an independent implementation."

DeepSeek V4.1 Flash does this extremely cheap. Then you can verify with more expensive model if something is not 100% right.

It does not have to be bytecode, I see a bunch of assembler in the outputs, it's just reading the functions from native libraries.