Oh well.

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.

Nothing stops someone from creating a competitor to Coil that also uses the Web Monetization API emerging standard and that competitor accepting subscriptions in another currency, including crypto. That’s one reason why it’s such a compelling idea.

So not a solution for content likely to be censored or adult content.

Seems like BAT is still the way to go.

The Web Monetization API standard Coil is based on does not reveal knowledge of what content is being paid for.

Sure, but the hard part of "getting paid on the internet for content" was never really "there isn't an open standard for payments!" – it was that established payment providers didn't generally want to enable transactions for certain types of content or to certain actors and/or charged prohibitive fees for the privilege of performing transactions at all.