Something big, maybe automated is going on.
I have seen someone pumping 2 million into a (comparatively) unknown coin, doubling its price - in a 15 minute candle.
No human who aims to make a good deal does this. Do it in a weeks time and you save hundreds of thousands!
And I have seen a +100% similar to this every second day for the last weeks.

Today it's Omni with about 3000 Bitcoin going in in one hour on Polo, currently +132%.

Either somebody does not know what to do with all the Bitcoins, or its a big market buy like for an ETF.

Or the conspiracy theory: someone is preparing a billion-heavy total crash of Cryptocoins. Like a central bank. The EZB warned just 2-3 weeks ago to not speculate with Bitcoin, when the price rose to 1700€.