Developers of applications using Bionic would only be able to charge (via the Android Market) those customers who don't know what rights they have under the GPL. All others would find ways to download and install those apps on GPL terms, i.e., free of charge.
Mr. Mueller doesn't seem to understand that if something is released under GPL that does not make it automatically free of charge. Just because most GPL software is free of charge, that does not mean that you can't charge for your software if you release it as GPL.
Another common misconception is that if your code is under GPL, you have to give the source code to just about anybody who wants to see it for free. No. Wrong. Only people who have the license for your software can get the source code, they have this right because it is granted to them by the GPL. And if you want to, you can certainly charge for use of this license.
So there is nothing stopping you from releasing your software as GPL, charging for it, and giving the source code to those interested parties that payed for the license to use your software.