And they have gotten into lethal trouble because of it, I think there is a ongoing case against Oreo because they abused their market power to affect in shelf p

And they have gotten into lethal trouble because of it, I think there is a ongoing case against Oreo because they abused their market power to affect in shelf positioning in a way which likely counts as unfair/illegal abuse of marked power. Most important grocery stores and similar are resellers, Amazon is a proxy. Sure that pretend they sell you things but actually you just buy things through them, not from them. (Except their own products.)