> implementing fully optional, widely blocking restrictions as "parental safety options") was the industry taking it seriously

The myriad of settings, accessed differently on every site or service, that everyone needs to be aware of, and actively fight dysfunctional defaults and frequent "helpful" resets after updates, are not the solution parents or anyone else are looking for.

Why are the defaults set to favor the company, in a way that makes them real customer/user-targeted security holes that people have to play endless wack-a-mole to secure themselves?

That is industry taking plausible deniability and the monetizing potential of parasitical behavior at scale "seriously" indeed.