Third party keyboards not working with the 13.0 update

So then it’s a matter of the developer of the keyboards to create an update that will work with apples 13.0 iOS? So in the meantime I’m without three of my favorite keyboards because Apple has done something in their update so the previous working keyboards now are useless? If that’s the case, then my next question is how do I uninstall this 13.0 upgrade and go back to the iOS I was previously using? I could care less about the dark mode feature and my camera worked quite well before hand, thank you very much apple!