I listen to Harley Davidson, regardless of whether I’d like to or not.

And their owners make extra sure of it.

Yep. For example, if your ISP is in the advertising business, I would definitely use a VPN, even after opting out w/ the ISP/cellular provider. IMO a lot of times when you opt out, it doesn’t mean they stop collecting information, it means they paused using that information for ad targeting.

ex: https://www.verizon.com/about/privacy/customer-proprietary-network-information

Here are some things you can do, roughly ranked:

• Use a password manager
• Assume anything you post/do online/financially can and will be used to build an advertising profile on you/train AI/be shared with government authorities
• Disable ad personalization/history/sharing of information via privacy settings of mobile phone, mobile apps, Google, Facebook, banks, credit cards, ISP, cellular service, everything
• Turn off third-party cookies.
• Use an ad-blocker on desktop and mobile. They also help prevent a lot of tracking.
• Don’t use Chrome. Consider Firefox/Brave/whatever else
• Avoid using ad-supported services/companies. Consider using paid alternatives. This means using alternatives to Google Search, GMail, Facebook for photos, etc etc.
• Use a profile deleting service like https://monitor.mozilla.org/
• Different browser profiles: general use, Facebook, personal (GMail / Google Docs), and maybe more
• Use a VPN w/ secured DNS
• Many Google accounts: one for general, YouTube, Google Docs/personal, and maybe more
• Use a different email address to sign up for every account. I use StartMail’s aliases
• Don’t use your personal phone number for most things (finance/healthcare excepted). Get another number via a call and SMS forwarding service