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ここはyoutube板ですので勉強は自分でやってください
少なくともgoogleはある期間ユーザーアクティビティを保存はプライバシーポリシーに明記されており
政府機関への開示も行っています
収集する情報
＞Information Google collects
＞Information we collect as you use our services
＞The information we collect includes unique identifiers,
＞browser type and settings, device type and settings, operating system,
＞mobile network information including carrier name and phone number, and application version number. We also collect information about the interaction of your apps, browsers, and devices with our services, including IP address, crash reports, system activity, and the date, time, and referrer URL of your request.
むやみに検閲できない根拠
＞We build security into our services to protect your information
＞We restrict access to personal information to Google employees, contractors, and agents who need that information in order to process it.
外部との情報共有
＞For legal reasons
＞If you’re using an Android device with Google apps, your device periodically contacts Google servers to provide information about your device and connection to our services.
https://policies.google.com/privacy?hl=en-US#infocollect
https://transparencyreport.google.com/user-data/overview?hl=en_US
企業はプライバシーポリシーの公表・内容の厳守しFTCの監督下にある
https://www.ftc.gov/news-events/topics/protecting-consumer-privacy-security/privacy-security-enforcement