Google is only dealing with pages + social media - no emails, no instant messaging and no data transfers
And it doesn't even try to look at the "dark" net.
Add to this Google isn't "Live" - if you put a page up now it takes several days to appear in Google (actually better now than it used to be because the Google spider crawls sites more often now)
The shear volume of data acquired in a minute would take even the fastest machines a few hours to index and sort - this created a massive "lag" in the data being acquired and when it can be consumed.
It is the legal framework and oversight we should be railing against here not the actual data acquisition.
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