Back in the day in my country, if your neighbor or taxi driver was informing the authorities of your habits and travels, this was considered a dangerously hostile action. If no willing informant could be found, there were torture basements to get it. It's what kept the government in power for so long. E.g. travel data makes it easy to identify nascent political groups.

Thankfully corporations have proven themselves so trustworthy and benevolent, we don't think twice about giving them the data they used to have to torture out of us. Likewise the governments, that we know are among the buyers [1], are just as beloved and uncontroversial, unlike in the old days.

[1] https://www.theverge.com/2023/6/14/23759585/odni-spy-report-...