Sex is everywhere. The internet has a lot of sex. It has been kind of the default since inception. Wild people just now know of its presence.
IMO the real "problem" here isn't technological, political, or corporate - it's just a slide of social norms toward hyper-permissibility of immodest or bad behavior. The resolution will likely be social as well, and people realizing that kids are getting exposed to smut will likely hasten that. Laws might get passed, corporations might change their policies, but only after the pendulum swings back socially.