Is this a paid post or something? Weird and avant-garde compared to what? The reason most of this crap never got archived is because it was the purest of crap, not the death of flash or other silly excuses.

Similarly nobody cares about the vast majority of YTMND or Vine.

There absolutely was a certain type of "nerd" into the junk on Newgrounds and they were probably the same loud minority who flocked to Facebook until they realized how crappy that was too. Nobody really wants to remember the internet between 2000 and 2015. Nobody likes most media from that era in general.