A notable mention is https://ubports.com/en/ which is different from postmarketos in a sense that ubports uses old kernels with heavy patches. That means: good support for things, but difficult future.
PostmarketOS uses the newest kernels and tries to integrate their patches into mainline kernel, so that the reliability is maintained with all kernel developers.
Enterprises just lease desktops / laptops and replace them with the latest version of Windows… my team used to be after reasons to get the latest OS / laptop, now IT have to prise them out of their hands