Great points @reddragonfly. I think one of the best benefits is finding an audience for their work. We are a pretty tight knit crew around here and by joining Steem, they will be finding community and getting access to an entire network of people that they never would have found otherwise.
Ultimately though, I think it depends on what the person is looking for. If they have previously been censored by YT or Facebook - then that talking point will be hella important to them. To someone who just wants to share their music and can't seem to get anywhere on Youtube - finding out about the Open Mic community and learning they can post their videos on Dtube as well may be a more captivating angle to discuss with them.