My BS speculation skills at work:
Why the spike at the end? Doesn't look like spam? OR maybe it is.
Too chaep TX fee for miners, smaller scale SPAM?
Or People woke up and suddenly felt the urge to move coins? Crash anticipation?
Actually they will spam it everytime they feel the price will be rising.
The mining cartel have a lot of bitcoin at their disposal. They can dump it anytime, to provoke a massive sell-off.
But when it wont work, they just spam the network to increase the fees, so the price wont go too high.
Now, looking at the last chart published by masterluc, where he shows some waves, we can see a pattern forming where bitcoin is going increasingly sidelined.
Maybe the intention is to stabilize the price, so that when LN is fully implemented, bitcoin can de facto become a currency. Who knows, I think its too early for that, bitcoin will still be a speculative asset for at least a couple of years.