Humans haven't even been off-planet for a century and we're already leaving trash everywhere. The moon. Mars. Our atmosphere. It's gross. And honestly it was only a matter of time before a similar digital barrage began.
Lone Signal is a project that will allow people to transmit any message they want into space. METI (Messaging for Extraterrestrial Intelligence) is not a universally accepted practice, though, because some scientists fear it will come back to bite us. I can't imagine why. But still people are lining up to send digital junk out into the abyss.