At some point, he decided he didn't want to do it anymore. He never gave me a specific reason why.

He hasn't entirely disappeared, though. He has other accounts and he sometimes reappears.

I don't know I could have had anything to do with it, but I was his main competition (and vice versa) on Castlevania III Alucard (US) for the first 2 months of 2018, and he pushed the record time all the way down to 26:11 before vanishing. What really strikes me is that all his runs are gone + he was top tier in pretty much every game he ran, and this wasn't the first time he completely dropped off the planet. He mysteriously came back mid January to beat my former WR of 26:32 and then left 2 months later, deleting every trace of him being on the internet almost. Trying to write the WR progression for Alucard since then would be very awkward.