Is Bigger Better? Why The ChatGPT Vs. GPT-3 Vs. GPT-4 'Battle' Is Just A Family Chat

Alright, now we understand that ChatGPT is just a smaller and a more specific version of GPT-3, but does it mean that we will be having more such models emerging in the nearest future: MarGPT for Marketing, AdGPT for Digital Ads, MedGPT for medical question answering?