Re: Streams is showing real patient benefits.
Google really are good at this stuff
And therein lies the heart of the problem - we know darn well what Google are good at. They are very good at ignoring the law and using their size to avoid the repercussions. They are very good at mining large volumes of data.
Thus, we can have little (or no) confidence that they won't take this data that should be kept in it's own secure silo, never leaving UK (or at least, EU) control and jurisdiction, and then mine it along with other data that would probably de-anonymise it.
So far, I have not read anything to suggest that Google has the corporate structures in place to respond as MS have done with the Irish emails case - ie tell the US authorities to sod off as the US company & staff don't physically have the access to provide them with the data which is held by a different legal entity on Irish soil.
But most of all, I have seen nothing (but plenty to the contrary) to suggest that Google wouldn't pause even a second to consider mining the data along with everything else it holds.