It's not about consumption, it's about having a vast majority of your demo being sexy women instead of a balance.

I'm still not following. Ads for a pickup truck are probably more likely to feature towing a boat than ads for a hatchback even if they're both capable of towing boats. Because buyers of the former are more likely to use the vehicle for that purpose.

If a disproportionate share of users are using image generation for generating attractive women, why is it out of place to put commensurate focus on that use case in demos and other promotional material?

I think you would really need to show that's the case. I'm sure nano banana has a huge number of users not generating sexy women.