Bitcoin restricted

Has any US player been given a reasonable explanation as to why some players are forced/restricted to depositing funds via Bitcoin? I’ve asked twice and both times, the best I get is, “it’s up to the discretion of the financial blah blah” but no real reason is given. Is there a certain criteria I’m not aware of? My brother deposits funds using various credit cards but I’m forced to pay fee after fee. I’m new to online poker, I don’t know everything, but I see no benefit to using Bitcoin except to put money in miner’s pockets rather than my account. If I’m missing something or if you know why I’m restricted, please let me know. Many thanks