The $100 developer fee is very annoying, but understand it's there to add a small barrier to entry. It makes people think twice about whether they really want to launch an app on the app store and therefore stops many users from publishing junk apps.
And yet, also impairs enterprising folks from also wanting to kick the tires on an idea. I don't mean established software engineers, I mean some teenager for whom $100 is an annoying enough sum to be a headache.
I would guess the long and capricious review cycle stops a lot of junk submissions, not the $100. If my mental model is correct any such junk app would easily make back the $100 in spammy ads on every click
To my knowledge, the fee is for the dev kit rather than the ability to publish on the app store. If it the aim was to prevent junk from being published, then surely the fee should apply at the point of submitting an app for review.
