These days how can one register a domain anonymously, using crypto as payment, and without KYC?
No first hand experience, however.
This is not a hypothetical, by the way.
99% of the target users will resolve it if they want access (by installing the necessary browser extension).
As for system emails, etc., they can come through any regular domain.
In contrast, when offering a service that is politically incorrect, at least in some geographies, it is useful to remain anonymous as the service provider. It is also then useful to not collect any unnecessary user data that could put the user at risk due to a data leak, although an email address is commonly still required for each user.
The crypto-privacy-coin world is at an altogether different level wrt privacy than the rest of the world. It is a lot closer to being the real deal.