The incentive to users is clear:
Earn AppCoins easily and quickly by paying a minimal amount of attention to apps, which can then be spent elsewhere.
Be able to make payments without putting in a bank account or credit card.
Have no personally identifiable info be tracked.
Pay with a wide variety of crypto (through Kyber integration).
The incentive to developers is clear:
More efficient advertising that cuts out the middleman.
Retain a larger cut of the profits from your app.
Only get your app verified once, then have a public, decentralized certification that your app is good for other, additional app stores to reference.
Accept payments in a wide variety of crypto (Through Kyber integration).
And the incentive to other app stores is clear:
Increase potential customer base (through the user incentives listed above)
Reduce overhead by not having to run every app through the full suite of verification. Any app already verified on the AppCoins blockchain is good-to-go.