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Are there proof that spotify normalize audio at -14LUFS?

Are there proof that spotify normalize audio at -14LUFS?
I did some empirical A/B comparison between mp3s donwloaded on my pc and audio streamed on spotify.

I choosed this quite loud songs on pourpose:

King of Convenience - Misread -10 LUFS
Radiohead - Burn The Which-9.5 LUFS
Beck - Colors -6.5 LUFS
Bjork - Arisen my Senses -8 LUFS
Carla Bruni - The Winner Takes it All -10.7 LUFS
Nick Cave and The Bad Seeds - Skeletons Tree -9.6 LUFS

Apple takes aI'm at Spotify with music-streaming service for $10 a month

Apple CEO TI'm Cook, right, hugs Beats by Dre co-founder and Apple employee Jimmy Iovine at the Apple Worldwide Developers Conference in San Francisco on Monday, June 8, 2015. The maker of iPods and iPhones announced Apple Music, its new, paid streaming-music service to launch this summer.

Is It Standard to Upload Music to iTunes, Spotify, etc. in 16 Bit Rather Than 24 Bit?

I was about to upload my music to TuneCore who would then distribute it to iTunes, Spotify, etc. and noticed that they said to make sure my music was in 16 bit format. It was my understanding that 16 bit is just for burning CDs. You have to dither/add the noise to bring 24 bit recordings down to 16 bit because CDs can't handle 24 bit, but it was my understanding also that if I'm uploading my music to online streaming services like Spotify or iTunes where people are purchasing DIGITAL copies of my music, shouldn't it stay in 24 bit?
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