What Google is doing here is specifically rejecting the chargers that do conform to the standard by tacking on a proprietary handshake. HP had a similar chargi

What Google is doing here is specifically rejecting the chargers that do conform to the standard by tacking on a proprietary handshake. HP had a similar charging DRM scheme on their first few models with USB-C charging but seems to have dropped it. Apple has been doing this with non-MFi chargers since iOS 7. A lot of people were mad when the OS update made their perfectly good chargers stop working. Of course now there are clones of the MFi authentication chip and even with a new chip revision Apple can't reject them without also breaking all of the old legitimate chargers. So it completely failed to actually solve the problem anyway.