I agree this is a collective action problem.

But making children (and adults, because how else can you tell without checking) give their biometrics to companies (and by extension the highest bidder (palantir, paramilitaries, and police)) that helped create and then exacerbated this crisis is like asking the drug dealer association to help folks quit by giving them new exotic chemicals heretofore undiscovered.

You 'win' the war on pollution by making companies actually pay for their externalities, repeat offenders cease to exist, their assets seized, and their executives are jailed, rather than just 'paying fines' for the thousand of corpses they leave in their wake.

Likewise, if social media companies produce informational or social 'pollution' so defined, we can do likewise and insist they defray the cost of the damage. If they are no longer profitable when the cost is not paid by society, then they'll have to learn to innovate again.