GPL doesn't help you one bit in this particular situation, because "regular users" would still be using the locked-down stock Android that came with their device. So they still can't install your app.
Anyone who is already running a rooted Android or otherwise customized OS isn't affected by this, only developers who want to distribute their app to users.
Anyone who is already running a rooted Android or otherwise customized OS isn't affected by this, only developers who want to distribute their app to users.