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http://www.supersimplestorageservice.com/

> The Super Simple Storage Service (S4) is a new innovation in cloud storage. Our advanced write-only storage provides the highest security, lowest cost, and simplest management available.

https://devnull-as-a-service.com/ (:

I didn’t dig into the details, but unless DwarfFS is a joke, I assume they mean the system supports create, read and delete operations.

I'd guess you build a fs image from an existing filesystem, so you'd only have read operations.

There's plenty of read-only media out there. I can see this being useful for container deployment -- you've got a database somewhere that you have read/write access to, but the deployed code doesn't need to be updated in the container. A readonly filesystem is a great way to enforce principle of least privilege.