I dont't see why people would want to use FLAC. The file sizes are huge and the audio quality difference is bearly noticeable compared to an encoding like .aac
35-70 MB it's not that huge, especially if you have a gigabit Internet connection. And if you have a good pair of headphones you can hear the difference between flac and aac.
Yeah. Even with a 100 megabit internet connection the size does not matter at all. The playing starts instantly when you push the play button and it still uses less bandwidth than a normal youtube video.
Or am I missing something?