How is that a dark pattern? What is the light pattern for getting feedback from users?

Not spam? There’s no “do not ask me again”.

Not typosquat? I responded with a sentence beginning in “1” once, and it jumped in during the race. It should have prompted with something like “WARNING: This will allow us to use this session including your source code for training, which is in violation of your account settings. Proceed with “Yes I understand”.

There are multiple ways to use feedback. Personally I would often be fine with actual human reading my feedback, taking in account the points I made and evaluating how it should affect their feature development and future roadmap.

Now what I would expect AI companies to do is to take things which were submitted as feedback and pretty much adding to training:

"Do more of this: <copy of the whole response which was flagged as good in feedback>"

"Do less of this: <copy of the whole response which was flagged as bad in feedback>"

It's paraphrased, but the point is that they will most likely use it more-or-less as-is and thus whatever is in there will be part of the model's training set rather than someone picking up the parts from response that are important and only including them (which happens with traditional feedback).