What is the 'Allow Full Access' permission for third-party iOS keyboard apps and what data does it expose?

• A.A) 'Allow Full Access' for an iOS keyboard enables: network access (sending typed content to developer servers), access to the device's stored information for autocomplete, and the ability to capture and transmit everything typed in all apps. This means the keyboard developer's server potentially receives passwords, credit card numbers, messages, and any other text input from all apps that use the keyboard.
• B.B) 'Allow Full Access' only enables the keyboard to download additional language packs from the internet; it does not transmit typed content.
• C.C) iOS automatically disables 'Allow Full Access' keyboards in sensitive fields (password fields, banking apps); the risk is limited to non-sensitive text input.