As a complete outsider looking at this, without additional context, I just have a hard time believing there aren’t more reasons, they’re just not willing to share them:

* I’m not passionate about it anymore

* I’m tired

* I want to repurpose my free time

* I’m not adding enough value compared to other options now available

In the end, it’s pointless to argue about why someone feels the way they do. If they are firm on their stance, don’t waste anybody’s time, no matter how irrational their argument is. Give up trying to be right.

Probably this guy should have just stopped engaging directly with some of the dialogue, but the fact that he is exploring the idea of trying to hand it off in some manner tells me he really does care about the project.