I have no doubts that you know about the "personal data flow" business; it is an old story — giant companies are "stealing" our data and selling it to each other.
I am not paranoid (maybe a little). They are not stealing. We are simply a herd willingly giving it to them.
So, OpenAI is no different at all.
There are a few amusing legal issues with them using YouTube videos for ML, but there's more from my recent experience.
A few days ago, I was having a small talk with ChatGPT about a very specific topic.
I hadn't googled it, or any related topics at all, not from my laptop, my phone, or any other device.
In this session, ChatGPT did not use Bing, yet the next few days my YouTube recommendations consisted of videos on that particular topic.
LMAO. Not surprised, just LMAO.