@DarthCoin's reply had some good possible explanations. 

siggy47

I remember 1 sat/vb but never at these market prices. I've been wondering the same thing.

The fees are just a market so my guess is that people are just not raising their fee fees and are being patient but that doesn't really explain it. I wonder if some wallet software has been changed to reduce fee estimation. I am very curious

bitcoin_beginners

Why Are On Chain Transaction  Fees So Low Now?

I remember 1 sat/vb but never at these market prices. I've been wondering the same thing. 

The fees are just a market so my guess is that people are just not raising their fee fees and are being patient but that doesn't really explain it. I wonder if some wallet software has been changed to reduce fee estimation. I am very curious 