I understood it as a joke referencing Aamazon's tendency to take just any open source product that happens to gain enough popularity, rename it and offer it as a shiny new feature of AWS.

Self hosted as a feature. Akin to managed vs colo hosting.

They pretty much already offer this with outposts (its technically their hardware but its on your premises).

By "self-hosted" you still mean still running on AWS hardware? I don't understand. Why would anybody pay EBS rates instead of S3 rates, to get data stored in the same place by the same people?