Maybe it is the reverse? It is not them offering a product, it is the users offering their interaction data. Data which might be harvested for further training of the real deal, which is not the product. Think about it: They (companies like OpenAI) have created a broad and diverse user base which without a second thought feeds them with up-to-date info about everything happening in the world, down to the individual life and even their inner thoughts. No one in the history of mankind ever had such a holistic view, almost gods eye. That is certainly something a super intelligence would be interested in. They may have achieved it already and we are seeing one of its strategies playing out. Not saying they have, but this observation would not be incompatible or indicate they haven't.
I distinctly remember search engines 30 years ago having a "live searches" page (with optional "include adult searches" mode)