Honestly, I'm just a lazy developer. My program, Keyhunt, isn't even optimized for GPUs yet! After more than three years, it's still riddled with bugs and quirks. But hey, despite all that, it's currently the fastest Baby-Step Giant-Step (BSGS) implementation available for CPUs. Not bad for a hobby project, right?
I am also lazy and I made the fastest (for now) implementation of bsgs for gpu. The difference between us and him is that we let people use our developments and sources, but he does not. If everyone sits in their own world and does not share knowledge, then there will be no progress. And this applies not only to him, but to others as well.