> Anyone with a credit card should be able to use their line of credit to purchase anything they please There is no "should". The lenders are private companies

> Anyone with a credit card should be able to use their line of credit to purchase anything they please There is no "should". The lenders are private companies who are lending you money at their own discretion; it's entirely their prerogative to stipulate how that money can be used. Naturally, when a certain product category has a high default rate, the lenders act in accordance with their self-interest and stop allowing their money to be squandered by blockchain gambling.