I very much doubt that existing GPTs have any fine tuning features at all. If they did then OpenAI would have shouted it from the rooftops.
They might by storing those up/downvotes for some far-future (and likely very expensive) fine-tuned GPT product, but I think it's more likely they just inherited those buttons from existing ChatGPT.
Yeah, that's most likely true. I am less sure this would be a "far future" feature, though, given it's probably not a ton of work and power users would probably be willing to pay for it. We shall see, OpenAI moves fast...
They might by storing those up/downvotes for some far-future (and likely very expensive) fine-tuned GPT product, but I think it's more likely they just inherited those buttons from existing ChatGPT.