OpenAI is worth >$100B because of the "ChatGPT" name which it turns out, over 400M+ users use it weekly.
That name alone holds the most mindshare in it's product category, and is close to the level of name recognition just like Google.
...according to investors. (ps. it's even >$150B)
In reality OpenAI is loosing money per user.
Cost per token is tanking like crazy due to competition.
They guesstimate break even and then profit in couple of years.
Their guesses seem to not account for progress much especially on open weight models.
Frankly I have no idea what they're thinking there – they can barely keep up with investor subsidized, non sustainable model.