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 put ads in the paid ChatGPT tiers. That is an absolute certainty. The only question is how long will they tolerate un-advertised eyballs on paid plans.