I think it is been available for free to everyone for a while to improve model performance. Monetization may be required at some point to cover compute costs. Sam Altman once tweeted a similar tweet.
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As expected. Thank you for sharing this tweet.
I feel if they allow the AI to display Ads, they would be able to make off some money to pay for the compute costs.
They would be able to make off money with ad display but this is an out-of-scope option. I think it is. It makes sense to have a usage fee of 3-5 dollars per month.