Why? Nothing about the decompiled source guarantees that it will compile to the same binary. And once you compile it for a new platform that TT never published

Why? Nothing about the decompiled source guarantees that it will compile to the same binary. And once you compile it for a new platform that TT never published for, it's an original binary generated from original source. It's as if person 1 built a machine (source+compiler) that generates paintings (binary) to sell, and then person 2 saw the painting and built an entirely different machine that can do the same thing. Person 1 can't tell person 2 what to do with their machine.