The disclaimer below

Third Party Keyboards provide an alternative way to input keyboard data. These keyboards can access all of the data you type, including bank account and credit card numbers, street addresses, as well as other personal and sensitive information. These keyboards may also access nearby text or data, which is useful for improving autocorrect functionality.

If you enable Full Access, developers are permitted to access, collect and transmit the data you type. In addition, if the third party application containing the keyboard has your permission to access location, photos, or other personal data, the keyboard can also collect and transmit that information to the keyboard developer’s servers

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