Yeah, I assume you mean our eyeballs (viewers) are the product and the advertisers are the customers that pay for more eyeballs. So give away the platform and sell the ads makes more sense. Charge a premium for fewer ads. (YouTube, Spotify, etc follow this model)
But there are strange quirks about embedded tweets and youtube videos I have noted
They never show ads (twatter or youtube). They need to drive you to their platform to serve the ads
I have a strong suspicion that they are not able to collect the demographic data on the viewers without your account login info so the advertisers would probably pay a lower rate for non-targeted ads.
Off topic, I think this is one of the funniest parts of Truth Social - the main content to draw viewers is Trump but all his crap is posted as screenshots (not even embeds that they could track) by Bots on other platforms where it gets a lot more eyes so there is no incentive to advertise on Truth if you can get a bigger audience on TwiXer. I guess the targeted prepper, red hat and lumpy pillow buyers might be an exception. At least youtube and elmo can track embeds