You’re the first to suggest that. Everything I know about residential electric service says that neutral and ground are to be bonded in one and only one location in a system, generally this is at the main distribution panel / service entry. That is the bond shown in the main panel The neutral and ground bars in the subpanel are kept separate but tie back to their brothers in the mainIf the grey lines are denoting neutrals, they shouldn't be tied together(paralleled) anywhere in the images, beginning with the one above the word main in the upper left panel. The neutral buses shouldn't be bonded to the panels. Grounds, under normal conditions, shouldn't carry any current.
Phase conductors must be run adjacent to their neutral conductors.
(I probably have no idea what those images represent.)