Linux

Technically, GPOs are just registry adjustments with English definitions tacked on. No doubt there will be tools for Home editions to fix this; for those that look, that is.

An example of this, that comes to mind, is Windows Update Blocker (WUB). All it does is enable the policies that block Windows Updates from Microsoft servers and stops their attempted workaround of the Windows Update Medic or whatever it is, which is solely talked with making sure the WU service is running. These are the same policies/registry settings that are triggered when an enterprise org uses WSUS to control update deployment.

I don't doubt, though, that Microsoft will to something shitty to ensure Home users cannot block it forever.