[RiderOfGiraffes]

If you provide a check-list or other criteria, be prepared for a world of pain. There will be people who claim they qualify, and they won't let go. They really, really won't let go.

They will harrass and harrangue you, they will call you liar, cheats, thieves and worse in public, and they will question your parentage and, what's worse, your ethics and morality.

And they won't stop.

I speak from experience.

You may choose to publish somewhere a list of things you consider, but say it's incomplete and for guidance purposes only. You may choose to provide a form response to those who you choose not to accept/list/whatever, and you may say that while it's no doubt worthy in it's own right you've decided it's not a good fit for your service.

Just don't be specific.

[petervandijck]

This is exactly the same reason why people who are hiring and decide not to give you a job offer usually won't say why they passed. There is a large percentage of people who can't take rejection.

[revorad]

I guess that explains Apple's app store policy.