Great, let's legalize recreational fentanyl too, since 'whatever people seem to like' is good for society.

In this case, unless you're a child, nobody's trying to control what content you consume. And if you are a parent and want to make sure your children can continue to consume the most addictive possible social media, by all means lie about their age. The law does nothing to stop you from doing so.

By contrast, having zero mechanism for the rest of the parents to control this, as is the current case, does impose your "do whatever feels good" values on the rest of the world.