Ian Shepherd from Production Advice UK has put together a nifty infographic showing the current state of loudness for online music platforms. For the big 3 of Apple Music, YouTube and Spotify, it shows how mastering any louder than -11LKFS is a waste of time and dynamics. Check it out at:
http://productionadvice.co.uk/online-loudness/?awt_l=LnRBg&awt_m=3j4kGiVYo8WrcYV