I feel if Apple's App Store had a demo/try button like the Android and Windows ones do, we would see a notable decrease in freemium releases as there appears to be simply no way to try apps before you buy them.
Companies are making far more money from freemium therefore they are all racing to embrace the model. Apple is happy too since they are taking a cut from all this additional iap revenue. This is extending beyond games now into all other kinds of apps. It appears to be the future everything is heading towards. And Apple has no financial incentive to put a stop to it.