“It’s capitalism” is an unsatisfying explanation because one the one hand it’s sort of trivially true, but on the other, good movies have been made under capitalism.
But you went to watch a blockbuster. These are made to make money above all else. You just aren’t the target demographic.
Just an another HTTP header, flagging if user is an adult. Set it to False if OS reports that the account used has parental controls enabled.
This is just meant to keep children out, not protect state secrets.