I don't see a way to opt-out without plastic surgery.
Make storing personal data like storing hazardous material. Something you absolutely avoid if possible, and treat with extreme care when you absolutely must store it.
Unfortunately the users of this site would rather tell you to move to the woods, go off grid, and paint dazzle camouflage on your face before admitting that a solution has to come from society rather than the individual.
If you want to scare businesses, ban arbitration clauses and other self-absolving Terms of Service. It won't stop Pornhub from getting hacked but it will make their lawyers piss themselves imagining the consequences. Trying to enforce SOC2 on the entire internet is an exercise in futility that will end with Russian hackers selling your credit card to teenagers.
Of course it doesn't appear "spontaneously," it's the result of your actions and others' actions, hence the "cabin in the woods" solution. The commenter is implying that expecting each individual to carefully act to preserve their online privacy clearly isn't producing good outcomes, and would like to see collective action through regulation to encourage better outcomes.
> If you want to scare businesses, ban arbitration clauses and other self-absolving Terms of Service.
That is one potential way to implement the suggested "hazardous material" policy. If storage of any data opens a business up to legal action with teeth then they'll stop risking the storage of such data outside of when the benefit to them outweighs the potential risk. Ideally the risk would be such that it becomes standard practice to process data on-device and design protocols and services such that only the absolute minimum required amount of information leaves end-user devices.