As with all software like this, the majority of revenue doesn't come from individuals buying licenses or paying small subscriptions, the money comes from enterprises that will pay millions of dollars for a solution that saves them even more money. Microsoft makes very little money from Windows 10 and 11 compared to how much they make from Windows server and their according licenses. ChatGPT will likely be the same, as corporations look to use it to cut costs in things like helpdesk and writing. No company will object to paying 100k a year to use software that can save them 5 million a year in labor costs.