What is out there that uses musl without PAM and hosts an OpenSSH SSHd with PasswordAuthentication?
As in: "Actually out there"
The hypothetical Alpine exists, yes, but what runs that like that?
A large number of Docker containers?
Edit: Sure, a small minority presumably run sshd under these conditions. But a small minority times the number of Alpine containers running in the world gets to a large absolute number.
Edit 2: You really don't need to look very hard to find public container examples at million-download scale.
Agent sandboxes today probably
What is out there that uses musl without PAM and hosts an OpenSSH SSHd with PasswordAuthentication?
Possibly public SFTP servers. I have allowed null passwords in the past for anonymous public SFTP and I run Alpine Linux exclusively for my servers both VM's and physical. The shadow package (PAM) did not get installed by default. I installed it but I had to specify it in the installation so there are likely people without it. There is probably a way to find them on shodan.io.
I will activate one for people to play around with for today:
There's no firewall and no password. Hack away HN. cd /pubget so*