I mean, I get it if you don’t like the default keyboard on your iPhone or Android device, but do you really want to be sharing everything you type with “random” company?
“Third-party keyboards are so dangerous because they want to be “smart”. Keyboards aren’t content to just live entirely on your phone and allow you to enter letters. Instead, they try to perform advanced text prediction and personalized autocorrect. To personalize your experience, they often upload data about how and what you type to the company’s servers.”
That doesn’t sound like a good idea. Maybe leave the smart keyboard behind.