I'm looking at the official one right now and it's still up.
This has been my experience, anyway.
Uptown funk you up Aaaaaaow! I think it's useful and a value added to the community.
From the listens those people are most likely going to support the creators afterwards, so as much that looped gifs to music may not be quite appealing in that context, the avenue of exposure ultimately matters to the point of being encouraged to directly support the artists featured.
Q: Where's a 100 Sub Special? Let me know which pony is your favourite! Curation gets views and then generates new direct views to artists.