In the interesting information category, Capital One blocked the purchasing of Crypto Currency with their credit cards sometime in the beginning of 2019. You won't even get a notification that a charge failed as they have notified their userbase and it's now part of their business rule set. One wonders if cryptocurrency is making them nervous.
Oh, fwiw, when I asked, they sited "Online scams" as the reason. While this does exist (Put this in the if it seems to good to be true category.)
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