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A shakedown to peel off some of the uncommitted money

Agreed, It's probably a good thing for Crypto to have some people who don't care about blockchain technology out.

Same with Ethereum, dropped from $740's down to high 400's then rebounded back to $700 in less than 24hrs.

Set your low buy limit guys, good way to catch the rebounds :)

I'm about to buy Cardano on the dip because its down to 0.40

Sadly happens often. And it will for the upcoming period. People want bitcoin but are not ready to convert to a crypto completely yet. Once we get past that point you will see the market stabilize.