Microsoft announced the implementation of the ability to use the systemd system manager in Linux environments designed to run on Windows using the WSL subsystem. Support for systemd has reduced the requirements for distributions and brought the environment provided in WSL closer to running distributions on top of conventional hardware.
Previously, to work with WSL, distributions had to use a Microsoft-provided init handler that ran under PID 1 and set up the infrastructure for interoperability between Linux and Windows. Now, instead of this handler, regular systemd can be used.
Source: opennet.ru