Mass surveillance by corporations, bad as it is, is less of a threat than mass surveillance by the government. Google can't put you in prison.
Additionally, making surveillance by corporations the norm they've eroded everybody's reasonable expectation of privacy, which is the standard by which U.S. courts judge if surveillance has gone too far. Now that we're all used to this level of corporate surveillance we won't blink when the government does it too.
IOW if corporations weren't hoarding this data governments would have a much harder time securing it.
[1] https://www.nbcnews.com/tech/security/us-government-buys-dat...