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Re:How Banks Could Control Gun Sales If Washington Won’t by gtf21 on Tuesday February 20, 2018 @12:58PM (#16422335)
As the article outlines, they already do by not allowing you to purchase cryptocurrencies.

I don't see any logical reason why "I'm paying them for a service" means they can't impose restrictions on the service they offer, except in the case of a monopoly, in which case there may have to be regulations on this.

Re:How Banks Could Control Gun Sales If Washington Won’t by prostoalex on Wednesday February 21, 2018 @11:56PM (#16435238)
The cryptocurrency decision was driven by higher than normal share of chargebacks. Even if the consumer is wrong, and bank eventually denies a refund on that BTC @ $16,000 purchase, there are processing and overhead costs that impact bank margins.