BlueRay came out in 2006, there are Teens that have probably never seen a CD or DVD.
Blockbuster died around 2010, apple stopped shipping optical drives in the last of their computers around 2013, Streaming became the norm, there might be teens that haven’t used “Discs” for video and have streamed everything.
Take a look back to when facebook chat and google chat where using an open protocol, but once their users counts got high enough they cut that part off.
It helps keep users on their platform… They hope users setup or keep accounts on their instance / platform then just cut off the other stuff at some point.
A lot of people I know had fairly large DVD collections but never accumulated very many Blue-ray releases.