I've noticed this trend with the younger element who come to our open mike nights. They have the special holder which clips to the mike stand as well. When I go to Greece I put about 60 songs on my kindle from my own lyrics database as the repertoire Yorgos leads in the taverna is more pop based than my blues/skiffle one, if he's sung a song I don't know I look up the words for the following year- inevitably he's then changed his set! Then it's the kazoo or nothing.
I am often surprised that teenagers who've only written a few songs still need to have their own words in front of them.
(Cynically this old grouch would say they are unmemorable, that's why!)

RtS