You should probably add a disclaimer somewhere in OP. In no way does this represent actual people moving money for actual services, goods and whatever. It includes everything, including:
1) People moving money to their own (other) addresses/wallets.
2) Exchanges and other services moving their money.
3) Moving Bitcoin into cold-storage (can fall under both point 1 or 2).
and you forgot trading with zero fees, so selling in one second 100 bitcoin to buy it again couple seconds later.
Bots moving so fast coins that it building momentum in such graphs.
and you forgot to read the topic first and take a look at the chart!
this chart is representing the "transaction volume" not the "trading volume" what you are saying about the zero fees is about "trading" and has nothing to do with this since that is done off-chain inside an exchange website.