just some notes:
there is a video quality setting. I'm unsure if that lowers the barrier to hosting by setting high to medium before having someone try to join.
the test to allow hosting seems to allow 1mbit uploads, but the result is not recommended. You really want low latency and over 2 megabit to actually play the game.
if the host turns on share play the potential guest has to be observant, because there is no alert, just a little controller icon appears. The guest has to go to the menu to select join to kick things off.
chat gets all screwed up during the connection test prior to the game.
at the end, the guest is left with the game icon in their xmb, if they didn't already have the game. Of course they can't run it. They can delete it though.