Albums were uploaded to YouTube a long time ago, though. For instance, TTT's standard edition was uploaded to Rihanna's VEVO. YouTube also counts as a streaming service and its as legitimate as Spotify so I don't see a problem.
It's not full, 3 new songs + VOTF and 24K Magic that were already uploaded.
I don't get the "mess" comments. It is not the first time that someone did it and it is a good move, some people will listen to it and buy if they like it. It will increase his SPS numbers anyway (yt counts, right?).