The valid argument is that it's generally harder to convince people to pay for web content than it is for content on iOS where this product is already successful, presumably because iOS users are a self-selected group who are more willing to pay for digital content.
There doesn't seem to be any argument for making the site work 'properly' in 'every' browser and discontinuing the iOS version other than a dislike for iOS or iOS users.
There doesn't seem to be any argument for making the site work 'properly' in 'every' browser and discontinuing the iOS version other than a dislike for iOS or iOS users.
Why should they discontinue a successful product?