Wouldn't want to give out valuable ad space[1] for free now would we.
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From the tweet in your linked post:
> This could help OpenAI give free users more generous usage and features, while users on paid plans stay ad free, which fits with the high costs of running ChatGPT and the revenue they expect from shopping and ad related features
They will just introduce cheaper, ad supported tier, price hike it to the previous price of ad-free tier and slow-boil the user base