Well you are hosting videos that are on lbry but its done automaticly, its not something that you have to do manyaly. You just enter the desktop aplikacion and watch videos. And rest is done on itsown. Videos that you watched you are now hosting for others to watch and thats it. You just set how much memory you want to allow app to use, so it doesnt fill up your drive and thats it.

And if you are content creator you host your videos just at first so couple of people can see them, and after that people are watching and hosting your videos vithout you doing anything.