Where did they talk about uploading whatever you are typing simply in relation to that option?
The most popular one is Swiftkey:
http://swiftkey.com/en/privacy/
For users that opt in to SwiftKey Cloud, we will collect your email address, basic demographic information and information concerning the words and phrases that you use (“Language Modeling Data”) to enable services such as personalization, prediction synchronization and backup. We may use data provided by you to develop and improve our Products.
Read the privacy policy of your keyboard if it need full access. If it doesn't, you might want to be extra careful with it.
Note, this is opt-in but do not presume the code is always perfect. That means if you give it full access but do not yet opt-in, you're relying on the developers to make sure not to upload the code. If there's a bug or they messed up something, they could upload your stuff without your opt-in permission.
That's why full access option is important, it prevents the keyboard from having any network access in the first place and does not rely on any code. Even Apple warns that if you enable full access, it will allow apps to transmit any data you type.
However, we're getting off topic here. If we want to talk about it, create a separate thread or find an existing one. I think I saw one here already, don't remember the name of the thread.
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