>this puts the multitudes of other vendors/manufacturers out of business, and your own employer might be among their numbers one day
This is basic capitalism, Amazon built a better mouse trap. The rise of the internet destroyed those businesses, Amazon is just the name that got attached to a business model that was inevitable. Now we can debate the values of capitalism, but Amazon the company isn't the problem, if not them it would just be someone else. The unfortunate fact of progress in capitalistic society is that some jobs disappear, we don't have many loom operators today either.
>Their having this data on its own isn't harmful, but as others have noted, it represents harm in the sense of what how it _could_ be used if applied maliciously
This seems to be the crux of the issue, the idea that the data's very existence is somehow a threat. I don't buy the vague handwavey "bad government" versions are valid, if the government has fallen to fascist ideology then Google knowing your step counts and favorite coffee shop are the least of your problems.
And I don't worry about Google falling into some Orwellian nightmare for the same reason I don't worry about the government falling into it, Google is just a bunch of people. On average, they're going to be reasonable people who think using the data to bust down the doors of private citizens and harm them is bad. More importantly I fail to see how it makes shareholders any money to pursue that course of action.
>They shut down the internet, but what if instead the government started demanding data from Google or Facebook to identify and track down members of the opposition?
The Inquisition and the Nazis managed this just fine without Google. If you're relying on privacy to keep you safe from fascists, bigots, nationalists, and hate you're going to have a bad time. Those people don't care about your privacy, and if they can't get the information from Google they'll get it from your neighbors, your friends, or from you by introducing a tire iron to your knee caps.
The fight against fascism starts way earlier than when they start searching for individuals to disappear. If a society reaches that point, the presence or absence of Google won't save you.