Yes they do remove fun
Like this:
Imagine if a 11 year old wants to play portal, which is fun, but it's rated T for Teen so you have to be 13 or older to play rated T games, And now the 11 year old will wait for 2 years which is a looooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong time