While it's easy to victim blame people who have been caught out by this, it highlights a big issue with the curated App Store model: many people implicitly trust that any app that Apple has allowed onto the store will not be malicious and they will therefore do stupid things (such as providing their login details)
This is a massive breach of trust by Apple and they need to take the review process a hell of a lot more seriously than they appear to be doing
It's also ironic that Google have already killed this on their store, but it's still there on the iOS store!