00:00:00 sshd 28410 28410 28410 pts/0 00:00:00 bash 30968 30968 28410 pts/0 00:00:00 ps As you can see, the ps process is being ... bash───pstree $ tree /proc /proc ├── 1 ...

All other initial startup services are then started and managed by systemd, as shown by the process tree below from Ubuntu. As WSL currently uses init as the system and services manager ...