Microsoft has returned the keyboard to the App Store SwiftKey. It was removed from the store a month ago, but due to user reviews, they changed their minds.
The current version of the keyboard has not been updated since last summer. The company Vice President declared that the application would be finalized and new features would appear soon.
SwiftKey is a popular Android keyboard that iOS users also appreciate. In 2016, the company was acquired by Microsoft. It seemed that the project would be quickly closed and all the developments would be integrated into their products, but this will happen a little later.
SwiftKey allows you to install custom themes and supports swipe input. Many people like it more than the standard iOS keyboard. Try it, and you might like it too.