Pornography is the obvious answer, but presumably it would at first be Apple providing an initial suite of quality apps (that you can trust will be improved upo

Pornography is the obvious answer, but presumably it would at first be Apple providing an initial suite of quality apps (that you can trust will be improved upon) as usual, perhaps with more "demo" type things, along with a good SDK that would drive third-party adoption. This is a pretty standard playbook for them.