You are not the one who initially used the phrase "pyramid shaped", so I don't see why you would expect others to defer to your authority on what it means.
Given the cooperative* nature of normal conversation, one must assume (at least initially) that there is a reason for saying "pyramid shaped" rather than "pyramid scheme". The obvious interpretation (to me) is that there is a continuum between pyramid schemes and non-pyramid schemes.
Objecting to the placement of In-N-Out near the "non-pyramid scheme" end of things, on the basis that it is not at all a pyramid scheme seems like an aesthetic preference for binary categories - that's all right for you, but other people may generalize.
Given the cooperative* nature of normal conversation, one must assume (at least initially) that there is a reason for saying "pyramid shaped" rather than "pyramid scheme". The obvious interpretation (to me) is that there is a continuum between pyramid schemes and non-pyramid schemes.
Objecting to the placement of In-N-Out near the "non-pyramid scheme" end of things, on the basis that it is not at all a pyramid scheme seems like an aesthetic preference for binary categories - that's all right for you, but other people may generalize.
*https://en.wikipedia.org/wiki/Cooperative_principle