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So, the latest drop seems to be triggered by credit card companies blocking purchase of cryptocoins "'cuz volatile".

Am I missing something? Since when do CC companies get to decide where you use your card? I thought it worked the other way around — businesses decide whether or not they accept CCs.

Are there other examples of CC companies blocking (legal) purchases made by people with good credit history?

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Some credit card networks, processors, and/or banks also prohibit counterfeit or unauthorized goods, gambling, marijuana, tobacco, weapons, fireworks, radioactive materials, mug shot publication, bankruptcy lawyers, psychic services, etc. (copied from Stripe) I thought they also banned the sale of human hair (no joke) but maybe that's been changed.

Also keep in mind that these banks allow you to buy cryptocurrency with debit cards, just not with credit.

The greater fool basis for valuation runs out eventually. I believe this is simply a bubble popping.

So long as they are able, so long as it's profitable, people speculating in cryptocurrency will encourage yet more bubbles.

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