Can you point to the ones you're talking about? A lot of the services are actually not that, they're offering simplified API and RPC access to data that's siloed elsewhere or systems that are quite complex to manage. There's some stuff we wrote for fun because writing arduously complex code can be tedious and I enjoy playing around with random things but I wouldn't waste a lot of my time wrapping libraries. OK so an "id" service is a bit like, maybe we don't need that to be an API call but let's say you do and you do want unique IDs distributed across many nodes, that was actually a hard problem solved by stuff like Snowflake [1] and distributed node management like zookeeper.