Hosted featured layer has the option 'Keep track of who created and last updated features'. It makes possible to filter what features each user see and can edit.
The above option works pretty well when individual users add their own features (e.g.: user fill a form to add a new submission). They are adding their own featueres, and they will be the only user to see them (besides admins).
However, when working with multiple users within in an organization, sometimes, it makes sense to be able to create features for specific users and apply ownership of those users manually through the Creator field. Unfortunately, the Creator and Editor field is not editable at all. This option is also useful when migrating layers in order to keep who created and edited the layers.
So, enable editing capabilities for Creator and Editor fields in ArcGIS Online on any hosted feature layer, at least for the owner of the layer.