https://wccftech.com/microsoft-force-installing-windows-10-version-2004-on-some-devices/

In an update today, Microsoft has announced that it has started to train its machine learning based process that is used to automatically update devices that are approaching end of service. This means v2004 surprise is coming for those of you still running Windows 10 versions from 2018 and earlier.

While Windows 10 October 2018 Update was possibly one of the worst feature updates ever delivered to the operating system, a good chunk of users are still running that version. Since then the Windows maker has released Windows 10 May 2019 Update (version 1903), the November 2019 Update (version 1909 - also known as the first Service Pack-like update), and very recently the May 2020 Update (version 2004).