As an artist manager, I hate the fact that brands like YouTube are making a name for themselves using the brand of our band. I'm seriously looking at ways to keep ownership of artists material instead of growing other brands businesses. The best way i've found so far is to use our own app, that includes everything my artists have ever done. The best by far (in my opinion) is http://www.gigrev.com which allows the artist to own all of the photos, videos and audio uploaded in to it, unlike SoundCloud, Instagram, YouTube and the rest of them. Artists: never give all your rights away. Thats my advice.
I don't use sound cloud or instagram,
But I've discovered many a band on youtube that I would never have found without it, so I'm all for youtube.