Main people behind this is CloudFlare, so this will likely formalized API from CloudFlare Workers that over vendors will agree on. I was fairly hot on CFW until I decided I didn't want vendor lick-in. https://github.com/tombyrer/awesome-cloudflare-workers
I’m reminded of a quote by Babbage
> I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question
The S3 API is pretty standard a number of open source projects and cloud providers use it.
But the whole question smells funny. It’s much better in almost all regards to abstract over a storage interface in code rather than use something like SFTP.
It’s not some closed, custom binary protocol.
Ultimately I think OpenStack was too complicated, in much the same way that Kubernetes seems to be embracing. That said it is still widely deployed, mostly by telcos, large enterprises, and governments.