But you don't have to publish that modified apk to Play Store. You can just sign it with your own key and install the apk manually, no root needed. I know ther

But you don't have to publish that modified apk to Play Store. You can just sign it with your own key and install the apk manually, no root needed. I know there are some apps that do its own cryptographic signature verification on their own, but most apps don't do that, so replacing a LGPL library in an APK is actually feasible in most cases. It is not hard to do so either.