"Really, with stdin/stdout the sky is the limit, and there are minimal ties to any specific service since only the most generic raw cloud storage features are being used."

That's the key and that's why it's here. It's a very, very stretched analogy, but from the very beginning, we at rsync.net have tried to run rsync.net itself as a unix primitive.

After already supporting actions like this, for years:

  ssh [email protected] sha256 some/file

  ssh [email protected] s3cmd get s3://rsync/mscdex.exe

  mysqldump -u mysql db | ssh [email protected]"dd of=db_dump"

It made perfect sense to support workflows just like the one you describe above. And yes, you can indeed do just what you've written (with lz4 and openssl encryption)at rsync.net (with or without breakout to files).