I don’t believe OpenAI shares that information with anyone - and if they did they’d likely tell us eventually.
However, if you give the URL to someone, even if it’s someone close to you, it might eventually get linked. For more security, best to go the Assistants API route (a bit different) but functionally very similar to the concept. More heavy lifting needed, but there’s a lot of example code these days, and you do get the benefit of more control over security for your users.