It's answered in a rather roundabout way on their FAQ page for for membership accounts [1]:
>Can I use cryptocurrency to pay for my membership?
>No, all memberships must be paid by credit card in US dollars.
>Can I use cryptocurrency to pay for my membership?
>No, all memberships must be paid by credit card in US dollars.
It is possible to go ~anonymously from cryptocurrency to "paid by credit card in US dollars". Basically you barter cryptocurrency for a credit card payment. You can do it with someone you trust. Or you can negotiate online. But then you may get a stolen card account, which might be embarrassing.
I wonder if they accept gift cards.
Seems like BAT is still the way to go.