Tautologically, something restricted to adults does not involve sharing a minor's details with anyone since the entire point is to block access to minors. That said, not all of these laws are about access restrictions per se, so RTA is only a partial solution. In fact, the government doesn't need to mandate any solution; simply mandate that restricted services not be offered to/not behave in certain ways for children and place liability on the people offering the services. They can figure out the best compromise that follows the law while keeping their customers happy.