Ethereum's selling point has always been its advanced features making more complex applications possible, and its Achilles heel has always been that extra complexity is probably not actually a desirable feature here. Think about the endless problems with buggy smart contracts, even for things as simple as multi-signature wallets which Bitcoin can do in a straightforward way.

Just because you don't know why something is going on, doesn't mean it's arbitrary.

In this case it's because of a path to mass adoption: http://coinivore.com/2017/11/26/bitcoin-reaches-time-high-95...

David vs. Goliath