Earlier quoted context omitted.
What percent of Instagram users know the company behind it? Like is this even a real question?
I feel you like you cited that as an example of people knowing companies behind things and you don't realize that very many people do not know that the same company owns Facebook and Instagram... Corporate structures are things you know about if you follow tech news, but people mostly do not know about them otherwise. They've never heard of "Alphabet" either. Stuff like that.
Show me any brand in a supermarket and I couldn't tell you who owns them.
When put in these terms it shows it's perfectly normal not to know who's behind chatgpt.