I use them for email aliases via adyy, and self hosting things like jellyfin and nextcloud. I don’t really “need” the privacy, but I still like to have it if I can.
Njal.la is where I have all of my domains. You don’t have to give any info, you can access it through tor through a .onion domain, and you can pay with monero.
They are a little pricey, I’ll give you that. Just out of curiosity why shouldn’t domains be private?