The problem of 3rd parties
While I hope that Google get a good going over for this, I think something is missing from the commissioner's statement :
Finally, due account must be taken of the need to protect third parties affected by voice recordings.
I don't see any way that Google can do that - their agreement is with the owner of the device. Perhaps responsibility should rest with the owner - maybe owners/operators of such things should be obliged by law to inform 3rd parties and get their consent - or turn it off if any one declines.