so far it seems like each time ripple is pumped, the whales wait a little to see if XRP has any more chance of rising and when they give up on that hope they suddenly start dumping large amounts of this coin on the market, maybe it is just a coincidence but usually the foundation releases a large amount of it near that time, it is even possible they pump it so they can dump and earn a lot of money.
If you compare Ripple with Bitcoin, Ripple has real value, and real business use cases. If one day speculators say "ok guys, Bitcoin is bullshit, let's switch to Bitcoin Cash or Gold " Bitcoin could fell down to 100$, because it does'n have real economics value.
if we wanted to use a centralized and unlimited currency we would have continued using fiat, we never even started bitcoin in first place!