Why not just answer the question, even if somewhat vaguely (though not sure why)? Expecting every person to email you for a super secret private explanation? That’s… not in your best interest if you actually want to find someone interested. No one wants to email you to find out you made a basic note taking app of which there are a thousand and was why you couldn’t sell it, for example. But if it is something that sounds interesting — someone might be interested.
Otherwise, not to be mean, you’ll have a hard time finding someone who cares about another side-project dead app that couldn’t sell.
That’s just 2 cents though.
