No one thinks about their phone's keyboard, but it seems silly to use a private messenger app in combination with the default keyboard from Google or Samsung. Switching to a private keyboard is pretty easy.
Discussion
Couldn’t you just disable network permissions on it?
They don't appear in my app list so it's not intuitive how to disable permissions at the OS level like other apps. I've read about people using networking apps to block connection requests, but this seems like a high bar for the average user. It's so much easier to just install a keyboard that doesn't require sketchy permissions.
My keyboard needs two permissions: control vibration and run at startup. That's it.