Schema 1 images are deprecated for push and have been for a long time. There is no plans to deprecate pull for these images as they would make a large number of older images unavailable for pulling. Currently Docker will show a deprecation message when pulling one of these images with invalid instructions.

For example:

[DEPRECATION NOTICE] registry v2 schema1 support will be removed in an upcoming release. Please contact admins of the docker.io registry NOW to avoid future disruption.

Users should not be contacts registry administrators related to pulling these images. If you are using an older registry which only supports schema 1 push, then that is a valid instruction to users.