"The app requires your permission to access your keyboard. When you enable FULL ACCESS mode in the app settings, please remember that it may allow to access, collect and transmit any data and/or information you type, including any data and/or information you have previously typed with your keyboard" - Privacy policy

Don't think I'd want an app to even have an option to be able to know what I type on I keyboard (like passwords, private info etc.) I just don't think that it'd worth it to have a few different fonts. Your choice.